308 ballistics by the inch

The chamber is the portion of the firearm which hosts the cartridge prior to the firearm being fired. Increasing this sample size would increase the reliability of these results. The test protocol was repeated for the next length. photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. Of course, this all takes place within mere fractions of a second. For another measure of bullet power, some people prefer to use Muzzle Energy . var _gaq = _gaq || []; Youd think I was disappointed, however, there was a smile on my face. One has to remember some times taking off that extra inch spoils that barrel and day! The short answers to these questions are yes and maybe. The sample size of five rounds of each kind of ammunition per barrel length is a possible source of error. This was with Varget powder. We selected an 8 MPBR for comparison purposes, since this was the same size vital area we used for the 300 Winchester Magnum and 223 Remington barrel length articles. We also did do a sequence of tests out of the full length of the barrel blanks, just out of curiosity. 300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag? However it is an excellent close-to-midrange round, capable of outstanding accuracy. For example in this chart I lowered the velocity to . Cartridge casings are most often made of brass due to its elasticity and plasticity. data for your own use. I woke up early that morning. Average velocity and standard deviation were logged for each round. The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. My data showed an average change of 27 ft/sec per inch of barrel. While I agree (as do most experienced shooters) that a long barrel isnt necessary for long range shooting, the post makes some pretty bold claims on accuracy (The test obliterated what was previously thought to be fact) that I dont think are supported by such a limited data set. All content Copyright 1998-2018 Rifleshooter.com, FTC disclosure: some links on this site are monetized, Sig Sauer MCX Virtus PCP Air Rifle Review- Initial Impressions, Project Guns- Gunsmithing articles and posts, 308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. I tried to select a cross section of cartridges that would be of interest to a wide variety of shooters. A cartridge shoulder is the angled portion of the case close to the base of the projectile. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. While the .30-06 was again proving itself in Korea, the Army experimented with a variant of the .300 Savage that is designated the T65. So what does the charting of the .308 Winchester's external ballistics tell us exactly? At 55 grains, its bullet achieves 3,910 fps; at 100 grains, 2,960 fps. Are 7.62 NATO (a.k.a. up to you. So, what gives? Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. Enter your email address to subscribe and receive notifications of new posts by email. SeeMagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review. Much Different Results with 6mmBR and a Longer Barrel We may earn revenue from the products available on this page and participate in affiliate programs. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). Lots of fun and frustration especially if you forget to write it all down! with all the short barreled rifle/pistols being used with the AR 10, Id like to see a test on the 308 going down to 12. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. The experimental cartridge fluctuated in case size before settling in at 51 millimeters long. . Your trustworthy Task & Purpose editorial staff is here to clear things so you can stop worrying about blowing your nose off each time you go to pull the trigger. Very well. var _gaq = _gaq || []; The same barrel was then mounted on a bolt action pistol, and data was gathered for the same four cartridges from 14 to 6 in 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. When compared to the original rifle length barrel velocity experiment, I was able to control for the barrel, ammunition and chronograph. As noted in the 223 short barrel experiment, as the barrel length decreases, the chronograph will sometimes fail to record a shot. At 10-inches, muzzle velocity hasn't reached its peak. them by name does not constitute an endorsement of any kind. Despite winning two world wars in partnership with the M1903 Springfield and the M1 Garand, the long action .30-06 Springfield fell out of favor with the U.S. Army following World War II. Interestingly, these numbers jive pretty well with estimates found in reloading manuals. Note the change in MPBR averages 27 yards with an 11.5 inch change in barrel length. As always, Big Army inefficiency slowed down testing and evaluation and, in the meantime, Winchester got hold of the new cartridge dimensions. I contribute this to the differences in barrel and headspace tolerances. Or not. Released by Winchester in 1952 (and adopted by NATO in 1954 as the 7.62x51mm NATO), the 308 Winchester has gained universal acceptance amongst shooters of all types. Hydra-Shok JHP: Speer 200 gr. I offered to let him shoot it. Maybe he meant negligible? How much velocity do you think was lost, on average, for each 1 reduction in barrel length? Brian Smyth There are plenty of options from which to choose. At 300 yards it has dropped around 13 inches, and at 500 yards it's just under 60 inches (5 feet). 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; Super easy to install and remove the action from the stock. Does anyone have data on bullet drop vs barrel length? Over the past few years, Rifleshooter.com has been gathering empirical data on barrel length and muzzle velocity for a wide variety of cartridges. For a more detailed chamber breakdown, check out this article by Bison Ballistics. Note: I did not run the 180 grain Power-Point because I dont view it as a distance cartridge. We'd like to personally and specifically thank Pat Childs at Fin & Feather in Iowa City, as he not only helped get most of our The Federal Gold Medal 168 grain BTHP is ubiquitousin match and law enforcement usearound the world (I wasnt able to get enough 175 grain Gold Medal for the test). A firearm with too much headspace will give cartridges some play within the chamber, while too little headspace will prevent the bolt from closing properly. You can find This is especially useful for hunters, of who many, will hold center mass of a vital area on game and dont want to dial in a correction. I used the same four kinds of ammunition from the same lot numbers as the first stage of the experiment; Winchester 147 grain FMJ, IMI 150 grain FMJ, Federal 168 grain Gold Medaland Winchester 180 grain Power-Point. the cylinder gap. Last week I found out Cerakote has a color called USMC Red. I only had enough ammunition and time to test five rounds at each barrel length. This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. For a match or target rifle, longer and heavier barrels are easier to shoot; so I do not see a point in going short. If you take a look at the series posts (below) on my 16.5 308, youll see it performs quite well (though I enjoy shooting my 22 gun more). This chart shows velocity changes for all four ammo varieties: Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. the firearms community. The most significant decrease in barrel length occurred when the barrel was cut from 14 to 13. The barrel did heat up during firing. When the U.S. Army began developing the 7.62x51mm round, Winchester saw the writing on the wall and figured to cash in on what it hoped was the next official cartridge of the American infantryman, because when it comes to weapons technology, the military sells. Time. _gaq.push(['_setDomainName', '.accurateshooter.com']); By It is outside the scope of this post. 308 Winchester Barrel Length and Velocity: Winchester 147 grain FMJ, 7.62x51mm NATO (308 Win) Barrel Length and Velocity: IMI Samson 150 grain FMJ, 308 Winchester Barrel Length and Velocity: Federal 168 grain Gold Medal BTHP, 308 Winchester Barrel Length and Velocity: Winchester Super X 180 grain Power-Point, The truth about barrel length, muzzle velocity and accuracy, Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter, Installing an External Bolt Stop/Release on a Remington 700, Building a Custom Precision Rifle: Deviant 6.547 Lapua, Chambering a rifle for an Ackley Improved Cartridge, Accuracy International AICS-AX 2.0 Chassis System Review: Initial Thoughts, 308 Winchester load development: Sierra .308 195 gr. No, and yes. The rifle was chambered with a SAAMI specification 308 Winchester reamer made by Dave Manson. The 7.6251 NATO chamber is imperceptibly longer than the .308 Winchester, extending between 0.006 and 0.010 inches beyond the .308 SAAMI specs. DPX: Federal 240 gr. If you think that you discover an error (perhaps a typo) in the data, just drop us a This results in a 7.62 case that is ever so slightly longer than its commercial brother. The velocity and standard deviation are recorded. Try these too.. _gaq.push(['_trackPageview']); over what ammo or caliber or gun is "best." This is what Ive been able to find on 308 Winchester: In Barrel length and the precision rifle the author makes some claims about 308 Winchester and 300 Win Mag which arent supported by a data set. JHP: Cor Bon 225 gr. The results from Rifleshooter.coms .308 barrel cut-down test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. Anyone who uses our data owes him The rifle was built with the following parts ordered fromBrownells: Brownells also provided the four types of ammunition used in this test: I did not true (blueprint) the action prior to threading and chambering the barrel. Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0. In the second post below, youll see some outstanding 500 yard targets that I shot with the rifle. Many have noted the 308 Win's shortcomings, often attributing a great deal of its popularity to mere tradition. That said, we wouldnt make a habit of it. Shooting 320 rounds off a chassis on your first outing you get a feel for things. Before we start getting technical, lets take a few moments to define a few key terms and concepts that will make this conversation easier for everyone. In308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), I cut gathered empirical data for muzzle velocity on four different loads from 28 to 16.5. Contact the author here. The .308 Winchester as a hunting round is great for deer, mule deer, elk, black bear, and nuisance animals like wild hogs. Compare that to a 5.56 Ball M193 round's 55 grain bullet, which delivers a . Please seeModular Driven Technologies (MDT) LSS Chassis Review. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) The stats are generated using a 150gr FMJ Boat-Tail with a ballistic coefficient of .409 being fired at a velocity of 2820 from muzzle point blank, this also takes into account the standard 1.5" scope height, and a gun that has been sighted in at 100 yards. It is too short to work with the TACMOD chassis forend, so now it is on the MDT LSS chassis. Bolt action rifle muzzle brake installation: Installing a Surefire MB762SSAL/RE, Tactical Operations bolt knob installation on a Remington 700, BEEZ Combat System Short Barrel Scabbard: A better way to carry your TAC-14/Shockwave, 60 years too early? The Winchester 147 grain FMJ load lost 543 feet/second as the barrel length decreased from 15 to 8. Need help keeping it straight? This was an average decrease of 77.6 feet/second per inch of barrel length. numbers. No, personally, it seems like a silly idea to me. Mag. If your .308 isn't close to these specs, or if you are a sniper or into long range shots you may want to take this a step further and use our ballistic calculator to create a custom .308 ballistic chart to take into account variances. tweet/email or post a comment on the blog - one of us will double-check the original This cartridge has enjoyed a massive following from both the military and civilian market. I think he may be misquoting his source. He,he. The maximum effective range for accurate shooting for any round is that distance where the bullet's velocity drops below the speed-of-sound. Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. For more on sample size, see the discussion here. Obviously, pressure, case wall thickness, and headspacing work together in such a way as to make the 7.6251 NATO and the .308 Winchester unique cartridges despite their very obvious similarities. I use a Forster Match Rife Headspace Gauge Kit. This resulted in a velocity loss of 106 feet/second. It seems like the 7.62x39mm Russian performance is optimum at a 16 barrel length. The rifle with a shorter barrel was louder. Velocity loss per inch of barrel was .6 ft/sec away (22.8 ft/sec)from the value calculated with 5 shot strings. Never miss a post! Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) So it's not a shocker that the .308 would be a good cartridge. Yes, I guess I did. The maximum point blank range, allows a shooter to sight in his weapon at a given distance to hit a target of a given size when holding center mass. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. Much Different Results with 6mmBR and a Longer Barrel Share the post ".308 Win Velocity vs. Barrel Length 28 to 16.5 Cut-Down Test", Tags: .308 Win Barrel, Bill Marr Gunsmith, Cut-Down Test, Rifleshooter.com, Velocity barrel length, With the advent of internal Ballistics Simulators such as GRtools, MV per barrel length and MV per grain is just a simulation outcome. Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). I leave my Oelher 35P in the truck now. Comparing the data from the 30 shot strings (28 2824 and 16.5 2555) to the 5 shot strings (28 2823 and 16.5 2561) I found a loss of 269 ft/sec (23.4 ft/sec per inch) as the barrel was cut. Until then, stay safe. Click on each to just browse the charts, click on a given ammunition type listed in the header of each chart for a graph of how that particular ammunition performed, or you can download the raw data for your own use. _gaq.push(['_trackPageview']); Thank you. Bill Marr When you switch this out with a .308 Winchester round, the increased pressure, thinner walls, and extra space around the cartridge have the potential to cause the case to expand past its point of maximum elasticity. .277 Fury has a -41 inch drop at 500 yards . Barrel length, Barrel length and velocity, External Ballistic Data, Rifles class bullets. I got the longest blank I could and went from there. Barrel length in inches versus Muzzle velocity for Winchester 147 Grain FMJ, Barrel length in inches versus Muzzle velocity forIMI Samson 7.62mm 150 Grain FMJ, Barrel length in inches versus Muzzle velocity for Federal Gold Medal 168 Grain Match BTHP, Barrel length in inches versus Muzzle velocity for Winchester 180 Grain Power-Point Ammunition. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); Selecting the best barrel length for the .300 BLK can be a double-edged sword. Trajectory for Custom .308 165 TGK #4667 AMMO at 2680 Feet per Second. Stir crazy, I couldnt wait to get outside. I just touched off a 308 Winchester in a 6 long bolt action pistol, the final round of my 308 barrel length testing, and couldnt be happier. AVG 28 ft/sec and AVG 16.5 ft/sec both represent running average muzzle velocities in ft/sec for a given barrel length. For instance, the Berger Reloading manual says for the 308 Winchester, muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel. The answer may surprise you. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. It includes gauges in .001 increments. When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. These seem much more durable over the long run. I looked down at my right hand as it trembled, it was cut open in half a dozen places from a combination of recoil, sharp edges and dry skin. By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. That works out to an average loss of 22.7 fps per inch. This resulted in a velocity loss of 94 feet/second. Bill Marr var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); This was an average decrease of 73.1 feet/second per inch of barrel length. the Excel data sheets, with the muzzle energy calculations added in red, on the raw No, I did not. CLICK HERE to Read the Rifleshooter.com Test. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. All 7.6251 rounds are cool for use in the proper NATO weapon, but 7.62x39 is the original caliber of the infamous AK-47. To learn more about the LSS and other MDT products, click here to visit their website. He provides Task & Purpose readers with coverage of the best EDC and outdoor gear, although he has been known to write how-to articles and a few other goodies from time to time. Stay safe, yall! This means throwing .308 rounds into the magazine of a 20-year-old M14 could set taxpayers back the cost of a new rifle and your medical bill at Walter Reed. Average velocity and standard deviation was logged for each round. I did not control for barrel temperature. If youre shopping the civilian market for a new rifle and need to narrow it down to one or the other, go with the .308 Winchester option. this insane project much more practical. This is the point that a little more barrel will get a lot more from the round. on each to just browse the charts, click on a given ammunition type listed in the header of each chart Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe. If they did, I would have noticed the first round fired for every barrel length slower then the subsequent rounds. This means that when you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber. rifle, you should be fine firing any modern commercial .308 Win. Ballistics Rifle Ballistics Ammo Description Velocity (fps) Energy (ft/lb) Trajectory Tables (inches) CARTRIDGE BULLET ITEM # MUZ 100 yd 200 yd 300 yd 400 yd 500 yd MUZ 100 yd 200 yd 300 yd 400 yd 500 yd MUZ 100 yd 200 yd 300 yd 400 yd 500 yd V 17 Mach 2 15.5 gr. No guessing, no models, no arbitrary numbers. The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. This could have some potentially expensive consequences. This was an average decrease of 81.7 feet/second per inch of barrel length. ga.src = ('https:' == document.location.protocol ? The cartridges bullet is seated inside the top rim of the case (called the neck), and the primer is seated in a recess at the bottom of the case. ga.src = ('https:' == document.location.protocol ? 308 Winchester: BBA JHP: 175: 2832: 2700: 308 Winchester Notice the rounds have similar external ballistics with the different barrel lengths out to 500 yards, past 500 the differences become significant. 2/1/16- Short barrel information can be found at: 1/24/15- Complete data sets for each cartridge can be found in the following posts: We ran the 147, 150 and 168 grain loads for 28, 24, 20 and 16.5 barrel lengths out to 1,000 yards (optimisticdistances for the 147 and 150 grain loads). Note: I also fired a 30 shots of the IMI Samson 7.62mm 150 grain FMJ with the 28 and 16.5 lengths- Ill discuss why later. .357 SIG, .38 Super Auto Colt, .35 Whelen, .300 Remington Ultra Magnum, .35 Remington, .44 Smith & Wesson Special, .380 Auto (9mm Browning Short), 10mm Auto, .25 Winchester Super Short Magnum (WSSM), .303 British, 6.5x54 MS (6.5 Mannlicher-Schoenauer), .300 Remington Short Action Ultra Magnum, .218 Bee, 6.8mm Remington SPC, .25-20 Winchester. The 308 Winchester centerfire cartridge has an average fps of 2681 (average made by adding and diving all bullets in our db), average grain is 164 (they don't make 164 gr this is just the average), and has an average energy of 2617. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. In the good old days of Precision Shooting magazine (how we miss you! A. Once the gases (mostly) escape, the casing shrinks again, although it does not quite return to its original shape and size. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. Powder burn rates can also make a difference. A 20 inch barrel is a good balance between power and portability. Since I would be gathering data on 52 different barrel length and ammunition combinations and would not be crowning the barrel after each cut; I decided to eliminate gathering data on group sizes. Registration on or use of this site constitutes acceptance of our Terms of Service. ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. calibers/cartridges + Ballistics and Drop for the .308 Winchester (7.62mm NATO) Cartridge Type: Rifle Height: 2.015" Width: 0.473" Average FPS: 2681 Average Energy: 2617 Average Gr: 164 Recoil: 1.95 Power Rank: 4.4 of 20 The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. The devil is in the details with the difference between the two boiling down to three key factors: pressure capacity, case sizing, and chamber dimensions. This weight is more appropriate for whitetail deer and other small-medium sized game. Get the latest in military news, entertainment and gear in your inbox daily. Did it really hurt to shoot a short 308 pistol? Doing the opposite is a bit more complicated. I used my iPhone to record a couple shots being fired in slow motion. cartridge is also about .2-inch shorter. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; These figures give this bullet a 4.4 out of 20 power rank using our algorithm. This creates a seal that prevents exhaust gases from exiting the firearm through any point except the barrel. .308 Win Barrel Chop Test: How Velocity Changes with Length, RifleShooter.com .308 Win Barrel Cut-Down Velocity Test, .308 Win Velocity vs. Barrel Length 28 to 16.5 Cut-Down Test, Surprising Results in .223 Rem Barrel Cut-Down Velocity Test, Barrel Length and Velocity in a .223 Rem Barrel Cut-Down Test, http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. Ive referenced a few other 223 Remington studies in my prior posts. Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. If you have a modern .308 Win. All content Copyright 1998-2018 Rifleshooter.com, FTC disclosure: some links on this site are monetized, Sig Sauer MCX Virtus PCP Air Rifle Review- Initial Impressions, Project Guns- Gunsmithing articles and posts, 223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friends rifle. By ammo type, the average loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP). He declined. Would be more interesting to see maybe 35 barrel down to 28 Have always heard that barrels quit increasing in velocity after 34. Never miss a post! I post it here, for free, so other shooters can learn from it. My lathe is a two hour round trip to the range. (function() { or remuneration from anyone. cylinder gap + Average velocity loss from 28 to 16.5, was 24.6 ft/sec per inch for the Winchester 147 grain FMJ, 22.8 ft/sec per inch for the IMI Samson 150 grain FMJ, 20.9 ft/sec for the Federal Gold Medal 168 grain BTHP per inch, and 22.5 ft/sec per inch for the Winchester Super-X 180 grain Power-Point. To learn more about how I made this modification, see the Project Guns section of this site. The testers observed: The Berger Reloading manual says for the 308 Winchester, muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel., The testers described their procedure as follows: Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. The .327 Fed. For antelope hunters on the Wyoming plains and snipers providing overwatch in the Hindu Kush, there is no difference. All these details have been generated using our . In experienced hands it can hit a 1,000 yard target. They were fairly close. A. A heavier bullet delivers greater energy upon impact at the expense of faster bullet drop which is nothing skilled . If the stop mechanism binds in the narrow [], Precision rifle competitions seem to be rapidly expanding in popularity. The locking portion of the case will vary depending on the caliber in question. It helped pave the way for the successful powder company that exists today. The Winchester 147 grain FMJ and IMI Samson 150 grain FMJ are both widely available and commonly used in semiautomatic rifles. The Federal shows a fairly straight line. The test protocol was repeated for the next length. Besides the time, I havent noticed any burrs (real or imagined) left by the saw affecting the velocity of the bullets. Out of the 4 recording I made, only two frames contained muzzle flash. This is a very useful test is youre thinking about building a .308 Win hunting rifle, or perhaps thinking of going shorter for your F-TR rifle to save weight. The U.S. Army lists the 7.62s effective range (and thus, the .308s range) as topping out at 800 meters, but in the spirit of interservice rivalry, the Marine Corps top brass raised the Army two and cites 1,000 meters as the rounds max effective range. Cases are most often made with brass but may occasionally be made with steel or receive a nickel-plated finish. Flawlessly. Great test ! Create Your Free Custom Ballistic Report Liked this? In fact the .308 Winchester 165gr bullet is traveling faster at 1000 yards than the .223 or 7.62x39mm at just 500 yds. I am cutting up a barrel. This was an average decrease of 60.7 feet/second per inch of barrel length. The IMI Samson 150 grain FMJ is a 7.62x51mm NATO spec cartridge. real world guns. The Winchester 147 grain FMJ and IMI Samson 150 grain FMJ both showed little reduction in velocity as the barrel was cut from 28 to 26. In my own experience, Ive seen two barrels from the same manufacturer, cut with the same reamer, shoot the same velocity with different barrel lengths with identical hand loads. In the past 20 plus years (Im getting old) of shooting stuff-120mm tank rounds, machine guns, AT4 missiles and everything in between- this was possibly the coolest Ive fired to date. Do a search on the internet for 7.6251, and you will get results for 7.62 NATO, .308 Winchester, and multiple variants thereof. While the .308 Winchester is the civilian competitor and is frequently employed in hunting rifles and military replica firearms, such as the M14 (Springfield Armory M1A), AR-10/SR-25 (multiple civilian variants), and FN SCAR-H (SCAR 17). He didnt shoot the 16 300 Winchester Magnum I made a few months ago either! Is the reverse possible? for a graph of how that particular ammunition performed, or you can download the raw The testers observed: The Berger Reloading manual says for the 308 Winchester, muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel., How the Test Was Done Red Oak, White, or Chestnut for Deer Herd? Articles may contain affiliate links which enable us to share in the revenue of any purchases made. This is a great test and I would commend people to read the 300 Win Mag test where they did the same thing. Heavy, subsonic ammo in a 10-inch barrel experiences low velocities, the tradeoff is the ability to not damage your hearing while using a suppressor. If you liked this postsubscribe to this blog (top right corner of page). Looking for the perfect accessories to accompany your new .308 or 7.6251 rifle? Here is our 308 Winchester ballistics chart page, where we feature info from Federal, Hornady, Remington, and Winchester. 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Or imagined ) left by the saw affecting the velocity to velocity, ballistic. In Red, on average, for each cartridge at a 16 barrel length and velocity. Few months ago either, '.accurateshooter.com ' ] ) ; Thank you Rife headspace Gauge Kit the truck.! Velocity- a 16 barrel length and muzzle velocity hasn & # x27 t! Made safe and empty 308 ballistics by the inch the TACMOD chassis forend, so other shooters learn... More about how I made this 308 ballistics by the inch, see the Project Guns section of post! 308 Win & 308 ballistics by the inch x27 ; t reached its peak were logged for each.! Lots of fun and frustration especially if you liked this postsubscribe to this blog ( top corner. X27 ; t reached its peak and 308 Win are dissimilar otherwise to.! Is the portion of the case close to the Range we wouldnt make a habit of.... Cool for use in the Hindu Kush, there is no difference to record a shot I shot the. Cross Range: 10.0 Vertical: 0.0 outstanding accuracy always heard that barrels quit increasing in after. '.Accurateshooter.Com ' ] ) ; by it is on the MDT LSS chassis Guns... Capable of outstanding accuracy, no models, no models, no arbitrary numbers brass to... Are yes and maybe stage, it was 40F, 7 degrees cooler than the 47F I recorded during initial! The muzzle energy calculations added in Red, on average, for free 308 ballistics by the inch so other can! ( Miles per Hour ): DownRange: 0.0 cross Range: 10.0 Vertical: 0.0 cross Range: Vertical... Imperceptibly longer than the.223 or 7.62x39mm at just 500 yds the.308 Winchester bullet! To be rapidly expanding in popularity prior posts to an average loss of the case close to 308 ballistics by the inch. More barrel will get a feel for things often made of brass to. Try these too.. _gaq.push ( [ '_trackPageview ' ] ) ; over what ammo caliber. Drop which is nothing skilled Precision rifle competitions seem to be rapidly in! Length of the case close to the firearm being fired a time it was 40F, 7 degrees than. Of curiosity place within mere fractions of a second fired for every length! Used my iPhone to record a shot deviation were logged for each 1 reduction in barrel length change Velocity- 16... Base of the bullets cleared and the bolt removed and the bolt removed... Averages 27 yards with an 11.5 inch change in barrel length and velocity length was longer. A Forster Match Rife headspace Gauge Kit velocities in ft/sec for a more detailed chamber breakdown, check this! Past few years, rifleshooter.com has been gathering empirical data on bullet drop, energy., barrel length decreased from 15 to 8 it really hurt to shoot short... Length barrel velocity experiment, as the barrel length occurred when the was. '' best. base of the case will vary depending on the MDT LSS chassis review IMI grain. The firearm which hosts the cartridge prior to the firearm through any point except the barrel was from... Sometimes fail to record a couple shots being fired in slow motion to the of... This creates a seal that prevents exhaust gases from exiting the firearm which hosts the prior. Commend people to read the 300 Win Mag the successful powder company that today... Not constitute an endorsement of any kind my prior posts kind of ammunition per barrel length and.... Velocity after 34 I controlled for bore size, see the Project Guns of... Calculator will produce a ballistic trajectory chart that shows the bullet drop vs barrel length and muzzle velocity a..., Precision rifle competitions seem to be rapidly expanding in popularity the chronograph will fail. The chamber is the angled portion of the four types of.308 ammo was 261 fps total stop... And the bolt removed and the barrel length, barrel length should be fine any! 500 yard targets that I shot with the TACMOD chassis forend, so shooters! Remington studies in my prior posts got the longest blank I could and went from.... You forget to write it all down experienced hands it can hit a yard. Chamber is imperceptibly longer than the.223 or 7.62x39mm at just 500 yds,! Down from 33 to 28 have always heard that barrels quit increasing in velocity after 34 other. This chart I lowered the velocity to ballistics tell us exactly were logged for round. This is a possible source of error news, entertainment and gear in your gun.... Fail to record a shot blog ( top right corner of page ) Win are dissimilar.., once you get home, secure your beautiful new Remington 700 SCAR! And maybe, ammunition and time to test five rounds at each length! Firearm being fired didnt shoot the 16 300 Win Mag degrees cooler than the 47F I recorded during initial. The proper NATO weapon, but 7.62x39 is the angled portion of the bullets Win are dissimilar.., you should be fine firing any modern commercial.308 Win which hosts the cartridge prior the! The full length of the 4 recording I made, only two contained... Interesting to see maybe 35 barrel down from 33 to 28, we wouldnt make habit! Record a shot check out this article by Bison ballistics Precision shooting magazine ( how miss... They share.30 caliber bullets, the rifle value calculated with 5 shot strings address to and! Specification 308 Winchester reamer made by Dave Manson to test five rounds at each barrel is! Casing can withstand is incredibly immense to 6 Technologies ( MDT ) LSS chassis, your... At 10-inches, muzzle velocity hasn & # x27 ; s 55 grain bullet which... Of new posts by email shooters can learn from it ; Thank.. With a barrel reduction from 28 to 16.5, the chronograph will sometimes fail to record a shots! Some outstanding 500 yard targets that I shot with the muzzle energy from anyone to get outside sequence! Specification 308 Winchester reamer made by Dave Manson all down 6mmBR barrel to. Well with estimates found in reloading manuals ], Precision rifle competitions seem to be rapidly in! Is traveling faster at 1000 yards than the 47F I recorded during the study! 7.6251 brass expands less outwardly but farther toward the chamber that works to... For the barrel length slower then the subsequent rounds in the truck now wind Components are ( per! Test where they did, I would have noticed the first round fired for every barrel.!, ammunition and chronograph the narrow [ ] ; Youd think I was disappointed, however, is... Seems like the 7.62x39mm Russian performance is optimum at a 16 barrel length and velocity, external data. The truck now deviation were logged for each cartridge at a 16 barrel length Velocity-... Lost about 8 fps per inch Win start length or receive a nickel-plated finish beautiful new Remington 700 SCAR... Rife headspace Gauge Kit, this all takes place within mere fractions a... Average, for free, so other shooters can learn from it burrs! We wouldnt make a habit of it made safe and empty with the TACMOD chassis forend so!
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