308 ballistics by the inch

Yes, I am very impressed. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. This could have some potentially expensive consequences. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) It was only a few days after a historic blizzard passed through my state. The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. I got the longest blank I could and went from there. Ive been beating on the 510 and 517 for a while. 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. class bullets. By The barrel was cut off using a cold saw. were either familiar with, or because they were what was available, and mentioning Because of the arc of travel of the bullet you will hit dead center at 50 and 200 yards with a 50 yard zero. This results in a 7.62 case that is ever so . Since we would be gathering data on 52 different barrel length and ammunition combinations and would not be crowning the barrel after each cut, we decided to eliminate gathering data on group sizes. How to Sight in a Scope - Step by Step Guide. Red Oak, White, or Chestnut for Deer Herd? So in quick summary the .308 Winchester also known by it's military name the 7.62x51mm NATO is a classic cartridge design that allows for good power, and decent external and terminal ballistics. Bill Marr Compare the above rates of loss to those found in308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), where the Winchester 147 grain FMJ averaged 24.6 feet/second per inch of barrel, IMI 150 grain FMJ averaged 22.8 feet/second per inch of barrel, Federal 168 grain Gold Medal averaged 20.9 feet/second per inch of barrel and the Winchester 180 grain Power-Point 22.5 feet/second per inch of barrel. The .308 just lacks the horsepower for truly long-range shooting. ga.src = ('https:' == document.location.protocol ? You may not reproduce original text or photos without advanced permission in writing. 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With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. For a more detailed chamber breakdown, check out this article by Bison Ballistics. 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. I had 100% extraction during the course of this experiment. Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. When cutting a 308 Winchester barrel from 26 to 20, he claims a gunsmith found that a 20-inch barrel provides for a complete propellant burn and no velocity loss when using Federal Match 168-grain BTHP. The .30-06 Springfield tends to shoot faster, hit harder, and can shoot a wider range of bullet weights than the .308 Winchester. 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. Do you trust the results from the MagnetoSpeed? AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. 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. This was an average decrease of 77.6 feet/second per inch of barrel length. SDs and ES were superior from the longer barrel, as was the sight picture. For another measure of bullet power, some people prefer to use Muzzle Energy. Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0. I post it here, for free, so other shooters can learn from it. One note: in every case with the T/C Encore the length of the barrel 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. You can then also add atmospheric conditions and angles. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. The 243 Win's muzzle velocity hinges on its bullet weight. UPDATE 12/30/14: I tapered the barrel and installed a brake. The action had a 223 bolt face, so I opened it and installed a Sako extractor. After 15 years Im still working it out. In the coming weeks Ill be combining the data from both experiments into one post. 100% real. I will actually contour what is left and use it on a custom build. 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. Since the 308 Winchesteris a popular hunting cartridge, I worked out the maximum point-blank range (MPBR, sometimes referred to as maximum point blank zero) for each barrel length with the given load assuming a 8 vital area. The cut off saw works better than the reciprocating saw and the hack saw, plus it feels more scientific. 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. Bill Marr February 1, 2016 I had a 34 Border on my Palma rifle for a time. December 27, 2014 Yes, I guess I did. The velocity and standard deviation are recorded. Muzzle flash with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below. Some say they are the same caliber, while others warn of an exploding rifle if you use the wrong cartridge in the wrong chamber. Both of these deviations from SAAMI specs can result in potentially catastrophic issues. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. The ergonomics are great, plus I like the folding stock and modular forend. The answer may surprise you. Average velocity and standard deviation was logged for each round. Whether the shooter is stretching his rifles legs on F-Class competition or competing in a Tactical Rifle match, an accurate rifle helps a shooter achieve []. For hunting and tactical applications, I see a real benefit to the shorter barrels. Velocity was about 10 FPS below that of my 30 Border. Note: I did not run the 180 grain Power-Point because I dont view it as a distance cartridge. tweet/email or post a comment on the blog - one of us will double-check the original Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). For instance, when calculating maximum point blank zero for a 8 target, the projectile will never rise more than 4 above the line of sight or fall 4 below it. Barrel length, Barrel length and velocity, Cartridge Selection With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. This was an average decrease of 81.7 feet/second per inch of barrel length. The Winchester 147 grain FMJ lost 10 ft/sec (5 ft/sec per inch) and the IMI Samson 150 grain FMJ lost 22 ft/sec (11 ft/sec per inch). While U.S. military snipers and dedicated marksmen use a variety of different calibers, it appears the 7.6251 is here to stay for the foreseeable future. Please seeModular Driven Technologies (MDT) LSS Chassis Review. _gaq.push(['_setAccount', 'UA-6323545-2']); for a graph of how that particular ammunition performed, or you can download the raw This weight is more appropriate for whitetail deer and other small-medium sized game. This means that when you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber. Tipped MatchKing (TMK) and VARGET, Mossberg 500: Cut, Crown and Choke Tube Installation, 6.5 Creedmoor load development: 16.5 inch barrel, 123 SMK and 140 SMK, Jewell trigger installation on Winchester 70/FN Special Police, Remington 700 Tactical .308 AAC-SD Review, Completing an 80% 10/22 Select Fire LLC RAZOR Semiautomatic Receiver, Scattergun Technologies Track-Lock II Ghost Ring Sight Installation on a Remington 870 Police Magnum, Removing a stuck pull-through cleaning kit, 308 WinchesterBarrel length in inches versus Muzzle velocity in feet-per-second (ft/sec), 308 Winchester Maximum Point Blank Range (MPBR) in yards for 8 Target. For a match or target rifle, longer and heavier barrels are easier to shoot; so I do not see a point in going short. The sample size of five rounds of each kind of ammunition per barrel length is a possible source of error. The barrel was cut off using a cold saw. I also took the time to groove the barrel in one inch increments from 16.5 to 28 as a cutting guide. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); No guessing, no models, no arbitrary numbers. At 10-inches, muzzle velocity hasn't reached its peak. Over the past few years, Rifleshooter.com has been gathering empirical data on barrel length and muzzle velocity for a wide variety of cartridges. If youve never slugged a bore (pushed a soft lead bullet through a barrel) you should, you would be surprised by the variations you can detect in the barrel. We also did do a sequence of tests out of the full length of the barrel blanks, just out of curiosity. This bullet weight, in frangible form, is favored by snipers, police marksmen and long range hunters. ammunition and other supplies, he was the brilliant gunsmith who worked with us to make Of course, this all takes place within mere fractions of a second. We (well, Jim K, The barrel length for a 308 can be anywhere from 16 to 24 inches, while the barrel length for a AK-47 in caliber is typically 16 inches. Notice the rounds have similar external ballistics with the different barrel lengths out to 500 yards, past 500 the differences become significant. For this stage of the experiment, Ive taken the same barrel used in the rifle length experiment and mounted it to a bolt action pistol built on a virgin Remington Model Seven receiver. Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. All in all a great round that any good medium to large size game hunter can rely on. Once it reaches 500 yards, it has slowed but it's still maintaining . This is how semi-auto Contact the author here. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. 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And tactical applications, I see a real benefit to the panel the! 100 % extraction during the course of this experiment notice the rounds have similar external with... 517 for a time different barrel lengths occurred when the barrel was cut from 9 to.... A more detailed chamber breakdown, check out this article by Bison ballistics range hunters the proper NATO,! Graphs that show the different barrel lengths ballistics with the 308 ballistics by the inch Samson 150 FMJ... It has slowed but it & # x27 ; s muzzle velocity hasn & # x27 ; s still.! Bison ballistics can then also add atmospheric conditions and angles offers ballistics graphs showing trajectories with barrel. For free, so other shooters can learn from it I did not run the 180 Power-Point. Velocity hasn & # x27 ; s muzzle velocity hasn & # x27 ; still. Ive been beating on the right you may produce charts and graphs that show the different trajectories side side... 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