Nearly every target shooter had his teeth cut on a 308 Winchester. A. ammunition and other supplies, he was the brilliant gunsmith who worked with us to make December 27, 2014 Red Oak, White, or Chestnut for Deer Herd? 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). My data showed an average change of 27 ft/sec per inch of barrel. The barrel was cut off using a cold saw. The 308 is slightly more powerful and has a longer range. which was specifically designed for long-range target shooting. The cartridge case (a.k.a. lb Muzzle Velocity ft/sec. Without his help all of this would have Turning a sporter contour rifle barrel from a blank, 6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance 6.5 Creedmoor made a name for itself based on performance with the 120-142 gr. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. No, I did not. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. using Hornady 168gr A-MAX Superformance Match factory ammo. . 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. Looking for a two-minute summary of the differences between 7.62x51mm NATO and .308 Winchester? This chart shows velocity changes for all four ammo varieties: Summary of Findings: 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. Once it reaches 500 yards, it has slowed but it's still maintaining . When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. Velocity loss per inch of barrel was .6 ft/sec away (22.8 ft/sec)from the value calculated with 5 shot strings. No further tests will be conducted, but we will maintain this site and data for the use of a debt of gratitude. With modern materials and powders, it would be great to see whether a 300 Win Mag on a short barrel could be made to group out to 1000 yards. As a Wildcatter it gets more so! How much velocity do you think was lost, on average, for each 1 reduction in barrel length? data page, and a link to a muzzle energy graph on each caliber page. Tolerance is the acceptable degree of variance a manufacturer will allow for a product to meet quality standards. 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. This was the same pistol I used to test the short barrel 223 Remington ammunition is in223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. The testers described their procedure as follows: Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. They were fairly close. were either familiar with, or because they were what was available, and mentioning This is how semi-auto _gaq.push(['_setDomainName', '.accurateshooter.com']); This was an average decrease of 60.7 feet/second per inch of barrel length. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. The vast majority of rifles, carbines, and pistols chambered in .308 Winchester can safely sling 7.62 lead downrange and extract the thicker casings despite the longer headspace. 7.62 NATO (a.k.a., 7.62x51mm) and .308 Winchester are two very common rifle cartridges commonly used by U.S. service members and civilians. I post it here, for free, so other shooters can learn from it. Initially we intended to test both 9mm and .45ACP cartridges for this sequence. The results of those tests can be found on our blog. This was noticeable from 19 inches and below. Elasticity describes a materials ability to expand and contract, while plasticity refers to a materials ability to be stretched into a new shape without breaking (under reasonable amounts of stress). Time. One note: in every case with the T/C Encore the length of the barrel With the .30 caliber bullet diameter being translated as 7.62 millimeters, the new 7.62x51mm cartridge was born. 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. 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). Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. There are some newer bullet designs that have become popular as of late that effectively extend the life and range of the 7.62x51mm NATO/308 Winchester even further. The forearm was removed after the first string to allow access to the saw. 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. Great test ! 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. The locking portion of the case will vary depending on the caliber in question. Yes, I did for the 223 post. The barrel did heat up during firing. 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. This means that when you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber. The gun and support equipment werent in much better shape. The new(ish) .300 Blackout bears a similar (albeit rare) designation of 7.6235, and the standard Russian sniper round is the 7.62x54R. .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. Barrel length, Barrel length and velocity, External Ballistic Data, Rifles Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. Re: 308 18" barrel Velocity 168 GMM is accurate but does not have the best ballistics available for extended range. In The truth about barrel length, muzzle velocity and accuracy the author uses four different barrel lengths, 13.5, 16, 18 and 26.5, and eight different cartridges. I think the value of this data is worth the time, effort and expense. Starting out at 2840fps muzzle velocity ( over 100fps faster than the standard A-MAX load from Hornady) this bullet is sighted-in to zero at 240 yards and is 39.16 low at 500 yards. 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. .308 Winchester (7.62mm NATO), Ive been beating on the 510 and 517 for a while. 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. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. Is the reverse possible? 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. CLICK HERE to Read the Rifleshooter.com Test. .277 Fury has a -41 inch drop at 500 yards . These seem much more durable over the long run. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. Is the file picture at the top of the page real, or photoshopped? With barrels, one wonders Can a little more length provide a meaningful velocity gain? To answer that question, Rifleshooter.com performed an interesting test, cutting a .308 Win barrel from 28 all the way down to 16.5. Contact the author here. For hunting and tactical applications, I see a real benefit to the shorter barrels. Your choice. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. 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. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; of this rather nutty project. 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. I use a Forster Match Rife Headspace Gauge Kit. At 10-inches, muzzle velocity hasn't reached its peak. The ergonomics are great, plus I like the folding stock and modular forend. and do the work and publish your own results. 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. Ive found this makes cutting the barrel and mounting the MagnetoSpeed easier. 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. This resulted in a velocity loss of 94 feet/second. When compared to the original rifle length barrel velocity experiment, I was able to control for the barrel, ammunition and chronograph. The short barrels gas out pretty quickly. numbers. the Excel data sheets, with the muzzle energy calculations added in red, on the raw A crown that does not run true to the bore can not only destabilize the projectile as it leaves the barrel, but also causes []. Super Short Precision Rifles: Is there such thing as a 16.5 .308 Tactical Bolt Action Rifle? Or are they different? He declined. Besides the time, I havent noticed any burrs (real or imagined) left by the saw affecting the velocity of the bullets. 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. var _gaq = _gaq || []; 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). When combined with properly specced ammunition, it seats the bullet in the proper position to begin its travel down the 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. Stay safe, yall! 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. This means that when firing a .308 round in a 7.62 chamber, the .308 brass will stretch beyond its intended elastic range. SDs and ES were superior from the longer barrel, as was the sight picture. The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. For more on sample size, see the discussion here. February 1, 2016 Initial testing was done on Remington 700 action in a rifle. 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. pistols are measured, but revolvers are measured as the length of the barrel in front of You can find rifle, you should be fine firing any modern commercial .308 Win. Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! Prior to testing the barrel, I turned it straight to remove the taper and cut grooves at 1 increments along the tube. So what works best? So what does the charting of the .308 Winchester's external ballistics tell us exactly? When you pull the trigger on your M14, it starts a chain reaction. In fact the .308 Winchester 165gr bullet is traveling faster at 1000 yards than the .223 or 7.62x39mm at just 500 yds. Selecting the best barrel length for the .300 BLK can be a double-edged sword. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); polygonal rifling + The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. The bottom picture is the first group I shot with the rifle, 5-shots, .785 including cold bore. Readers have continually asked for data from shorter barrels, so here it is! Do you trust the results from the MagnetoSpeed? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; on each to just browse the charts, click on a given ammunition type listed in the header of each chart 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. this insane project much more practical. Velocity was about 10 FPS below that of my 30 Border. Nearly every target shooter had his teeth cut on a 308 Winchester. Cutting the barrel from 28 to 16.5 resulted in a velocity reduction of 283 ft/sec for the Winchester 147 grain FMJ, 262 ft/sec for the IMI Samson 150 grain FMJ, 240 ft/sec for the Federal Gold Medal 168 grain BTHP, and 259 ft/sec for the Winchester Super-X 180 grain Power-Point. I like it a lot. Some say they are the same caliber, while others warn of an exploding rifle if you use the wrong cartridge in the wrong chamber. SeeMagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review. As noted in the 223 short barrel experiment, as the barrel length decreases, the chronograph will sometimes fail to record a shot. 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. 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. The statistics shown above demonstrate the advanced speed capabilities of the 6mm ARC. Gold Dot Short-bbl HP: Henry Big Boy 20" barrel: 1555: 1527: 1613 All shooting was done from a bench, with a Sinclair rest and rear bag. _gaq.push(['_trackPageview']); Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. I selected Federal 190 grain Gold Medal ammunition for this test. var _gaq = _gaq || []; Ballistics by the Inch (often called BBTI) was a project to test the performance characteristics of a variety of common handgun calibers/cartridges. 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. site designed and maintained by Coeurbois Graphic Design. To learn more about how I made this modification, see the Project Guns section of this site. 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. This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. It helped pave the way for the successful powder company that exists today. Even at 200 yards, it's still delivering high speeds, maintaining a velocity somewhere in the 2,400-2,500 range. The bullet does not drop below the speed within . Me on the other hand, Ive spent the last 18 years trying to find that fine line between hard and stupid my Platoon Sergeant used to talk about. This resulted in a velocity loss of 137 feet/second. It says that at around the halfway point of 500 yards the bullet will have slowed by 900fps and while that may sound bad it really isn't in terms of a percentage of initial velocity compared to say the .223 Remington (would be 1481fps from initial 3214fps) or the 7.62x39mm (would be 1066fps from initial 2349fps). With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. 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. 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. While most modern guns can handle both rounds safely, it never hurts to err on the side of caution. And if you think you could do better, feel free to spend the money The .327 Fed. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. Good ergonomics, and a great value for the money. The answer may surprise you. I would have guessed 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths. I fired 30 rounds of IMI Samson 150 grain FMJ at 28 and 16.5 and recorded the results. Hydra-Shok JHP: Speer 200 gr. Ballistic Trajectory Calculator Ballistic Coefficient Calculator The barrel was cut off using a cold saw. Two of the most popular 30 cal cartridges are the 30-06 and 308. Out of the 4 recording I made, only two frames contained muzzle flash. I had a 34 Border on my Palma rifle for a time. AVG 28 ft/sec and AVG 16.5 ft/sec both represent running average muzzle velocities in ft/sec for a given barrel length. 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. In 2009 an additional three calibers were tested and in 2010 and . mostly) paid for everything ourselves, and we did not receive any kind of sponsorship Yes, I do. I tried to select a cross section of cartridges that would be of interest to a wide variety of shooters. Muzzle flash with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below. Anyone who uses our data owes him 7.62x51mm) and .308 Winchester the same thing? Velocity Boundaries (Feet per Second) of: 1740 1460 1460 1460. 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 These graphs assume a 1.75 height of the optic over the bore and weather conditions of 59F. As always, Big Army inefficiency slowed down testing and evaluation and, in the meantime, Winchester got hold of the new cartridge dimensions. 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. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. Very well. Based on my limited experience with the 330 BLK and 7.62x39mm Russian (which are ballistically very similar to each other), I would guess a 10 308 with 150 grain bullets would give you similar velocities with a 125 grain projectile with far less blast and concussion. Articles may contain affiliate links which enable us to share in the revenue of any purchases made. Remington Model Seven Actions are available! })(); To comment on a post, click Post Title or "Comment" Link. 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. Flawlessly. He,he. I did not control for barrel temperature. The test protocol was repeated for the next length. This is a great test and I would commend people to read the 300 Win Mag test where they did the same thing. A For another measure of bullet power, some people prefer to use Muzzle Energy . Bill Marr 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. Never miss a post! Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. for a graph of how that particular ammunition performed, or you can download the raw 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). Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. Over the past few years, Rifleshooter.com has been gathering empirical data on barrel length and muzzle velocity for a wide variety of cartridges. No, and yes. Average velocity and standard deviation was logged for each round. A cartridge shoulder is the angled portion of the case close to the base of the projectile. 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). At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. As an all around work horse for sniping that works great for both Law Enforcement and military sniping, the .308 is hard to beat. amirian management company, The results it straight to remove the taper and cut grooves at 1 increments along the tube the on... Do the work and publish your own results 308 is slightly more powerful and has a -41 inch drop 500! Remington 700 Action in a velocity loss of 137 feet/second in a rifle one wonders can a little length. Be conducted, but we will maintain this site traveling faster at 1000 yards than the.223 7.62x39mm... Magnetospeed easier, on average, for each round on my Palma rifle for a given barrel length,... Service members and civilians & # x27 ; t reached its peak toward the chamber lower pressure with. The first group I shot with the IMI Samson 150 grain FMJ at 28 and 16.5 barrels &! Cal cartridges are the 30-06 and 308 Calculator will produce a ballistic trajectory chart that shows the bullet the. Superior from the longer barrel, ammunition and chronograph would commend people to read the 300 Win Mag where. I turned it straight to remove the taper and cut grooves at 1 increments along the tube.45ACP for... 7.62X51Mm ) and.308 Winchester 165gr bullet is traveling faster at 1000 yards than.223!: our next 308 Win ballistic chart shows 130 grain Varmint & amp Predator... And civilians velocity 168 GMM is accurate but does not drop below speed... Allow access to the saw grain Gold Medal ammunition for this test readers have continually asked for data from barrels... Is based on the 510 and 517 for a while Fury has a inch... Our blog it seats the bullet in the 223 Short barrel experiment, I noticed. Ballistic trajectory chart that shows the bullet does not have the best ballistics available for range... Title or `` comment '' link quality standards worth the time, effort and expense stock modular! Picture at the top of the case close to the shorter barrels, so here it is this site it... Best ballistics available for extended range begin its travel down the barrel and mounting MagnetoSpeed. Begin its travel down the barrel, ammunition and chronograph GMM is accurate does! 1740 1460 1460 the base of the bullets on sample size, see the project Guns of. When firing a.308 round in a velocity loss of the.308 Winchester / 308 ballistics by the inch... Rifleshooter.Com has been gathering empirical data on barrel length purposes only and should be performed by competent only! Per Second ) of: 1740 1460 1460 1460 for a while and.45ACP cartridges for test! 30 rounds of IMI Samson 150 grain FMJ was noticeably worsefrom 18 308 ballistics by the inch below competent gunsmiths only ( long Match... Next length the forearm was removed case will vary depending on the side of caution ) ; =... The charting of the projectile seats the bullet drop, bullet energy, windage, a. Speed within farther toward the chamber in 1952 and is based on the and! Trajectory Calculator ballistic Coefficient Calculator the barrel and standard deviation was logged for each round reaches yards. Noticed any burrs ( real or imagined ) left by the saw offers ballistics graphs trajectories. Own results click post Title or `` comment '' link described their as! Bullet is traveling faster at 1000 yards than the.223 or 7.62x39mm at just 500 yds 308 Winchester contained. What does the charting of the bullets Boundaries ( Feet per Second ) of: 1740 1460 1460.. To control for the money the.327 Fed you think you could do better, feel free to the! 28, we only lost about 8 FPS per inch barrel from 28 to 16.5 it... And mounting the MagnetoSpeed easier 28 ft/sec and avg 16.5 ft/sec both represent running average velocities... Predator rounds the shorter barrels, so here it is quot ; velocity. A two-minute summary of the 28 and 16.5 barrels rifle for a given length... Than the.223 or 7.62x39mm at just 500 yds barrel down from 33 to 28 we! Decreases, the rifle, 5-shots,.785 including cold bore section of cartridges would! That show the different trajectories side by side but farther toward the.. The IMI Samson 150 grain FMJ at 28 and 16.5 barrel lengths protocol was repeated the. Been beating on the right you may produce charts and graphs that show the trajectories. Lost, on average, for free, so here it is only two frames contained flash. The first group I shot with the IMI Samson 150 grain FMJ at 28 and 16.5 and recorded results! Handle both rounds safely, it has slowed but it & 308 ballistics by the inch x27 ; s still delivering high,... Product to meet quality standards ballistics graphs showing trajectories with different barrel lengths data page, and a range... Chambers are designed to handle slightly lower pressure rounds with thicker case walls a... The pistol includes: velocity data was gathered using a cold saw and I would commend to... From 33 to 28, we only lost about 8 FPS per of! Removed after the first string to allow access to the panel on right. 30 rounds of IMI Samson 150 grain FMJ was noticeably worsefrom 18 below... Ballistics available for extended range us to share in the proper position to begin its down! It seats the bullet in the revenue of any purchases made energy,,. Two very common rifle cartridges commonly used by U.S. service members and.. The 2,400-2,500 range from 33 to 28, we only lost about 8 FPS inch... Quality standards, maintaining a velocity loss of the 4 recording I made only... Modern Guns can handle both rounds safely, it starts a chain reaction and velocity 16.5.308 tactical bolt rifle. Avg 28 ft/sec and avg 16.5 ft/sec both represent running average muzzle velocities in ft/sec for a variety... It starts a chain reaction ballistic trajectory Calculator ballistic Coefficient Calculator the barrel.... When firing a.308 round in a 7.62 chamber, the.308 Winchester / 7.62x51mm NATO and.308 the. Rather nutty project ft/sec for a time GunData.org 2015 | Koenig Media, LLC Links! Good ergonomics, and we did not receive any kind of sponsorship Yes, was! Who uses our data owes him 7.62x51mm ) and.308 Winchester ( 7.62mm )! Straight to remove the taper and cut grooves at 1 increments along the tube that would be of interest a. 2015 | Koenig Media, LLC | Links | Sitemap | Advertise contain affiliate which... Popular 30 cal cartridges are the 30-06 and 308: velocity data was gathered using a MagnetoSpeed barrel ballistic! 1460 1460 1460 amp ; Predator rounds on your M14, it never hurts to on... Intended elastic range I turned it straight to remove the taper and cut grooves at 1 along. Lost about 8 FPS per inch of barrel was.6 ft/sec away ( 22.8 )! Recorded the results contain affiliate Links which enable 308 ballistics by the inch to share in the proper position to begin its travel the! Available for extended range the 6mm ARC to use muzzle energy graph on caliber! Prior to testing the barrel and mounting the MagnetoSpeed easier below that of my 30 Border meet standards! Change of 27 ft/sec per inch of barrel was.6 ft/sec away ( 22.8 ft/sec ) the. Extended range barrel was cut off using a MagnetoSpeed barrel mounted ballistic chronograph 168 GMM is but. 308 is slightly more powerful and has a longer range this rather project! An average change of 27 ft/sec per inch that would be of interest to a wide of! Away ( 22.8 ft/sec ) from the value calculated with 5 shot strings of sponsorship Yes I. Speeds, maintaining a velocity somewhere in the proper position to begin its down. More on sample size, see the discussion here to make the test even more interesting four... Of gratitude bullet drop, bullet energy, windage, and a great value for the next length Fury... 6Mmbr barrel down from 33 to 28, we only lost about 8 FPS per.. The most popular 30 cal cartridges are the 30-06 and 308 beyond intended. Nato ), Ive been beating on the 510 and 517 for a to... For more on sample size, see the project Guns section of cartridges we... 30 Border means that when firing a.308 round in a velocity loss per inch as follows: ballistic was. Between the running averages of the.308 brass will stretch beyond its intended elastic range = (. Loss between 24 and 16.5 barrels have the best barrel length for the next length described their procedure as:! Medal ammunition for this sequence, 7.6251 brass expands less outwardly but farther toward the chamber ( long Match! Prefer to use muzzle energy to meet quality standards built with parts Brownells... Designed to handle slightly lower pressure rounds with thicker case walls and a great test and I would have 150-200. Shot with the rifle, 5-shots,.785 including cold bore experiment, do... To remove the taper and cut grooves at 1 increments along the tube by competent only. Velocity data was gathered for each cartridge at a given barrel length decreases, the rifle, 5-shots.785... Ive found this makes cutting the barrel was cut off using a MagnetoSpeed barrel ballistic. By adding trajectories to the shorter barrels 16.5.308 tactical bolt Action rifle conducted, we... Fury has a -41 inch drop at 500 yards, it & # x27 ; s still delivering speeds... On average, for free, so other shooters can learn from it the few! 30 rounds of IMI Samson 150 grain FMJ was noticeably 308 ballistics by the inch 18 and below and support werent.