Average velocity and standard deviation was logged for each round. It's fine to 600-800 yards and is fine at that range out of an 18" 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. Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. After 15 years Im still working it out. 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. No further tests will be conducted, but we will maintain this site and data for the use of
Create Your Free Custom Ballistic Report Liked this? If you liked this postsubscribe to this blog (top right corner of page). The NATO 51 round first entered service in the 1950s but lacks the R of the rimmed Russian round. The statistics shown above demonstrate the advanced speed capabilities of the 6mm ARC. 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. These figures give this bullet a 4.4 out of 20 power rank using our algorithm. . One has to remember some times taking off that extra inch spoils that barrel and day! We may earn revenue from the products available on this page and participate in affiliate programs. I woke up early that morning. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) The 7.62x51 NATO is a superior round to the .223 in terms of knock down power, this fact has been tested in Iraq and Afghanistan. A heavier bullet delivers greater energy upon impact at the expense of faster bullet drop which is nothing skilled . This means that when firing a .308 round in a 7.62 chamber, the .308 brass will stretch beyond its intended elastic range. Thank you. 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. The muzzle blast was so violent, it chopped open my Edgewood bag when it got too close. polygonal rifling +
Last week I found out Cerakote has a color called USMC Red. Very well. There are plenty of good sources of information on this topic. My data showed an average change of 27 ft/sec per inch of barrel. Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. Youd think I was disappointed, however, there was a smile on my face. While we have went to great lengths to make sure that it's as accurate as possible this rendering should not be used to generate specs for casings. 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). _gaq.push(['_trackPageview']);
It includes gauges in .001 increments. Powder burn rates can also make a difference. There are plenty of options from which to choose. Ive been beating on the 510 and 517 for a while. If you have a newer 7.62 rifle, such as the civilian SCAR 17 or an AR-10 type carbine, always double-check with the manufacturer to determine whether or not you can safely chuck .308 rounds downrange. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
The latter has nearly twice the propellant, and is therefore better able to fell very distant game. This results in a 7.62 case that is ever so slightly longer than its commercial brother. Please seeModular Driven Technologies (MDT) LSS Chassis Review. It details drop, time, energy, velocity, range, and does so in 50 yard steps that are easy to understand. Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! Welcome Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. Maybe ask the doctorate students at MIT. I got the longest blank I could and went from there. And if you think you could do better, feel free to spend the money
Flawlessly. Muzzle: 100 YDS: 200 YDS: Velocity (FPS) 3050: 2691: . The 30-30 Winchester 150 gr. This was with Varget powder. cartridge is also about .2-inch shorter. 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. This was within 7 ft/sec of the value I generated with the 5 shot strings(262 ft/sec). 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). Contact the author here. This is how semi-auto
The .327 Fed. I did in the 223 and 300 Win Magposts, and was shocked with the performance of a saw-cut crown. Great test ! With tunning accuracy is 99.7%. Yes, I guess I did. I had 100% extraction during the course of this experiment. The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. According to multiple non-scientific studies, the average .308 case weighs in around 160 to 170 grains each, while 7.62 brass usually comes in at over 180 grains apiece. I shook vigorously from head to toe. For more on sample size, see the discussion here. 22" is optimum for the 308,Longer will get more velocity, but at a price. By .277 Fury has a -41 inch drop at 500 yards . The cartridge is an ammunition assembly that combines the projectile (i.e., the bullet), propellant (or powder), and the primer (the ignition switch) into a single unit housed inside a cartridge case. How to Sight in a Scope - Step by Step Guide.
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 maximum effective range for accurate shooting for any round is that distance where the bullet's velocity drops below the speed-of-sound. The cuts were made in one-inch intervals with a rotary saw. Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. Super Short Precision Rifles: Is there such thing as a 16.5 .308 Tactical Bolt Action Rifle? Re: 308 18" barrel Velocity 168 GMM is accurate but does not have the best ballistics available for extended range. Maybe he meant negligible? My 16.5 308 Winchester (above) is a fun little rifle. I like it a lot. .308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length, .308 Win Barrel Chop Test: How Velocity Changes with Length, RifleShooter.com .308 Win Barrel Cut-Down Velocity Test, Surprising Results in .223 Rem Barrel Cut-Down Velocity Test, .223 Rem Velocity by Barrel Length Cut-Down Test Results. Initial testing was done on Remington 700 action in a rifle. Short Rifle, Long Range: Testing our 16.5 308 Remington 700 out to 635 yards, 16.5 Inch 308 Winchester Precision Rifle: Summary of a Short Rifle. 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. 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 accuracy of the predicted MVs is more than 99% accurate without tuning the simulator for a given rifle. Temperature was 47 F.. While you can get close estimates to anticipated velocities by examining anecdotal accounts from different shooters and looking over load manuals, the data gathered in an actual experiment provides a baseline that can help inform your decision making process. Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0. The initial testing was done in 2008 and tested the velocity of 13 common handgun cartridges as it related to firearm barrel length. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. The Federal 168 grain Gold Medalload lost 512 feet/second as the barrel length decreased from 15 to 8. Red Oak, White, or Chestnut for Deer Herd? For firearms and ammunition, these differences are measured in PSI, fractions of an inch, and millimeters. Time. 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. JHP: Cor Bon 225 gr. The following is a ballistics chart in table format that details the bullet trajectory of a 30-30 Winchester 150 grain HP X30301 and a balistic coefficient of .218. Average velocity and standard deviation were logged for each round. 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. He didnt shoot the 16 300 Winchester Magnum I made a few months ago either! A
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. .308 Winchester (7.62mm NATO),
This bullet weight, in frangible form, is favored by snipers, police marksmen and long range hunters. I tried to select a cross section of cartridges that would be of interest to a wide variety of shooters. Velocity was about 10 FPS below that of my 30 Border. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. 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. He declined. This creates a seal that prevents exhaust gases from exiting the firearm through any point except the barrel. In the coming weeks Ill be combining the data from both experiments into one post. Wind Direction is: 3.0 o'clock and a Wind Velocity of: 10.0 Miles per hour. A. It was only a few days after a historic blizzard passed through my state. And thanks to our spouses, who were not just tolerant but enthusiastically supportive
ammunition and other supplies, he was the brilliant gunsmith who worked with us to make
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. Increasing this sample size would increase the reliability of these results. The 308 is slightly more powerful and has a longer range. (function() {
ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. This was an average decrease of 73.1 feet/second per inch of barrel length. Blueprinting (Truing) a Remington 700 Action, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter H4895 is the first powder Hodgdon introduced. 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. These things are known to be pretty tough, so that should be an indication of how much recoil was generated. To learn more about the LSS and other MDT products, click here to visit their website. ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. 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. While the external dimensions of both 7.6251 and .308 cases look identical, there are virtually imperceptible differences which, when combined with the differences in the two different chamber dimensions, result in different headspacing for each caliber. Interestingly, these numbers jive pretty well with estimates found in reloading manuals. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. Troubleshooting seized ejectors. (adsbygoogle = window.adsbygoogle || []).push({}); .308 Winchester (7.62mm NATO)-Winchester Power-Point, .308 Winchester (7.62mm NATO)-Hornady BTSP InterLock, .308 Winchester (7.62mm NATO)-Ultramax Sierra HP, .308 Winchester (7.62mm NATO)-Winchester E-Tip, .308 Winchester (7.62mm NATO)-Federal Hi-Shok Soft Point, .308 Winchester (7.62mm NATO)-Federal Sierra MatchKing BTHP, .308 Winchester (7.62mm NATO)-Federal Trophy Bonded Tip, .308 Winchester (7.62mm NATO)-Remington Swift Scirocco Bonded, .308 Winchester (7.62mm NATO)-Ultramax Nosler Ballistic Tip, .308 Winchester (7.62mm NATO)-CorBon HPBT, .308 Winchester (7.62mm NATO)-Cor-Bon DPX, .308 Winchester (7.62mm NATO)-Remington Core-Lokt Pointed Soft Point, .308 Winchester (7.62mm NATO)-Norma Nosler Partition, .308 Winchester (7.62mm NATO)-Sellier & Bellot PTS, .308 Winchester (7.62mm NATO)-Ultramax Speer Boat Tail. Never miss a post! The rifle with a shorter barrel was louder. Fear not. That works out to an average loss of 22.7 fps per inch. 30-30 Ballistics Chart & Coefficient. 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 ammunition and other supplies, he was the brilliant gunsmith who worked with us to make this insane project much more practical.Without his help all of this would have been much more difficult and perhaps impossible. Thanks for the kinds words about the 308 and 300 Win barrel length posts. In many cases, you can, but if you have any doubts, stick with the NATO rounds. The heavier weight and newer designed 175gr Sierra . Do a search for .308 and you will find similar results, albeit with fewer references to 7.62. SDs and ES were superior from the longer barrel, as was the sight picture. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. The picture at the top of the page is an actual screen shot I took off my iPhone video recording. A. rifle, you should be fine firing any modern commercial .308 Win. Like the 5.56 versus .223 comparison, understanding the differences between 7.6251 NATO and .308 Winchester is an exercise in patience that has the potential to save you and your wallet some pain and agony. SeeMagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review. This is not shown in the data, nor has was it shown in data for the 223 and 300 Win Mag posts. CLICK HERE to Read the Rifleshooter.com Test. 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. Furthermore, the
The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. The PowerRank is an estimation of the cartridge power. Temperature was 47 F.. UPDATE 12/30/14: I tapered the barrel and installed a brake. We did all the work. The Model Seven uses the same barrel dimensions as the 700, so unscrewing the barrel mounting it on the Model Seven (checking head space of course) provided me a serviceable pistol . However, testing indicates it may not be as much as initially thought. 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. this insane project much more practical. Average velocity and standard deviation were logged for each round. Once it reaches 500 yards, it has slowed but it's still maintaining . Much Different Results with 6mmBR and a Longer Barrel I cant find the source document and data set (he does have some nice graphs), but it seems the author is trying show you dont need a long barrel for long range shooting. 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. 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. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
Until then, stay safe. Besides the time, I havent noticed any burrs (real or imagined) left by the saw affecting the velocity of the bullets. been much more difficult and perhaps impossible. Never miss a post! Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. Barrel length, Barrel length and velocity, External Ballistic Data, Rifles 308 Winchester: BBA JHP: 175: 2832: 2700: 308 Winchester Out of the 4 recording I made, only two frames contained muzzle flash. .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. 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