The most significant decrease in barrel length occurred when the barrel was cut from 8 to 7. The rifle used to record data from 26 to 16.5 inches (above). Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. Blueprinting (Truing) a Remington 700 Action, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter H4895 is the first powder Hodgdon introduced. It was only a few days after a historic blizzard passed through my state. 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. This was an average decrease of 77.6 feet/second per inch of barrel length. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. One note: in every case with the T/C Encore the length of the barrel
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. ammunition and other supplies, he was the brilliant gunsmith who worked with us to make
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. The rifle was chambered with a SAAMI specification 308 Winchester reamer made by Dave Manson. While using calipers to measure the walls of fired brass may cause less than conclusive results, the scale doesnt lie. At 55 grains, its bullet achieves 3,910 fps; at 100 grains, 2,960 fps. Rifleshooter.com and its authors, do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website. Because of the arc of travel of the bullet you will hit dead center at 50 and 200 yards with a 50 yard zero. 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). 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. Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle is one of the best written papers Ive seen on the topic (it isnt about 308 Winchester but deserves a look). Never miss a post! SeeMagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review. As a Wildcatter it gets more so! By ammo type, the average FPS loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP). Without his help all of this would have
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. Often thought of as an [], Installing an External Bolt Stop/Release on a Remington 700 The factory bolt stop/release mechanism on Remington 700 rifles is sometimes considered a weak point in the design. We may earn revenue from the products available on this page and participate in affiliate programs. tweet/email or post a comment on the blog - one of us will double-check the original
So, what gives? Temperature was 47 F.. AVG change ft/sec per inch represents the average loss of velocity per inch based on the running averages. The barrel was cut off using a cold saw. Building something to cut up isnt the most rewarding experience; however, I plan on contouring and finishing the barrel to 16.25 (thats why I stopped at 16.5). This was an average decrease of 60.7 feet/second per inch of barrel length. In fact the .308 Winchester 165gr bullet is traveling faster at 1000 yards than the .223 or 7.62x39mm at just 500 yds. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
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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. JHP: Cor Bon 225 gr. Just ask Todd Hodnett. You can then also add atmospheric conditions and angles. them by name does not constitute an endorsement of any kind. All shooting was done from a bench, with a Sinclair rest and rear bag. At 300 yards it has dropped around 13 inches, and at 500 yards it's just under 60 inches (5 feet). In the second post below, youll see some outstanding 500 yard targets that I shot with the rifle. I would have guessed 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths. I think the value of this data is worth the time, effort and expense. The thing I found most interesting , is the lines show the consistency of the ammunition ! It is outside the scope of this post. The first number is the value of this cartridge, and the last number is the value of the most powerful round in our bullet database. DPX: Federal 240 gr. Troubleshooting seized ejectors. Yes, it did. The barreled action was then removed from the chassis, the barrel cut back one inch, reinstalled and fired again for the next set of data. 300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag? mostly) paid for everything ourselves, and we did not receive any kind of sponsorship
The barrel was cut off using a cold saw. All in all, this was a very thorough test by the folks at RifleShooter.com. It was LOUD. The short answers to these questions are yes and maybe. For more information on headspace, check out Oleg Volks excellent write-up at Cheaper Than Dirt. Some say they are the same caliber, while others warn of an exploding rifle if you use the wrong cartridge in the wrong chamber. The gun and support equipment werent in much better shape. 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. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. My calculations assume a 1.75 sight over bore height. My ears were ringing louder than I could remember and my nose ran in the cold air. At 10-inches, muzzle velocity hasn't reached its peak. been much more difficult and perhaps impossible. (More powder and more pressure). real world guns. So what does the charting of the .308 Winchester's external ballistics tell us exactly? using Hornady 168gr A-MAX Superformance Match factory ammo. _gaq.push(['_setDomainName', '.accurateshooter.com']);
Stay safe, yall! ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. We (well, Jim K,
.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. Muzzle flash with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below. (Yes, grains are an actual measurement of weight.). 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. Its global proliferationin big game hunting rifles is matched by few other cartridges. Or not. I like them- in some ways you dont lose a lot. Once it reaches 500 yards, it has slowed but it's still maintaining . *Casing image above is an artist rendering and not a real photo of .308 Winchester (7.62mm NATO) Ballistics cartridge. . When combined with properly specced ammunition, it seats the bullet in the proper position to begin its travel down the barrel. Since we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. The 7.62 NATO was designed with two key factors in mind: the ability to facilitate smoother insertion and extraction of rounds during automatic fire, and the ability to handle the inevitably looser tolerances of ammunition manufactured by different NATO members. Registration on or use of this site constitutes acceptance of our Terms of Service. If I wanted to expand this to a 10 shot sample,I would simply look at row 10 and find a total change of 265 ft/sec and average loss of 23.0 ft/sec per inch of barrel. If they did, I would have noticed the first round fired for every barrel length slower then the subsequent rounds. Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. All these details have been generated using our . Until then, stay safe. Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe. Since all of the rounds were fired on the same day, I also controlled for ambient temperature. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. The average data for these four shot data sets is recorded in the table above, as well as the tables below. 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. This resulted in a velocity loss of 118 feet/second. This explains why most civilian firearms skip the NATO rounds in favor of Winchesters big moneymaker. The barrel did heat up during firing. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. The IMI Samson 150 grain FMJ is a 7.62x51mm NATO spec cartridge. 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. I shook vigorously from head to toe. 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