308 ballistics by the inch308 ballistics by the inch

Velocity was about 10 FPS below that of my 30 Border. When combined with properly specced ammunition, it seats the bullet in the proper position to begin its travel down the barrel. ga.src = ('https:' == document.location.protocol ? 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. 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. Do a search for .308 and you will find similar results, albeit with fewer references to 7.62. This was an average decrease of 73.1 feet/second per inch of barrel length. All in all, this was a very thorough test by the folks at RifleShooter.com. 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. The .327 Fed. 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. Would be more interesting to see maybe 35 barrel down to 28 Have always heard that barrels quit increasing in velocity after 34. Are 7.62 NATO (a.k.a. The barrel was cut off using a cold saw. 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. Skip to main content; Skip to secondary menu; Skip to primary sidebar; . 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. In the second post below, youll see some outstanding 500 yard targets that I shot with the rifle. Ive referenced a few other 223 Remington studies in my prior posts. Anyone who uses our data owes him I think cutting the same barrel is preferable over comparing different barrels of different lengths. Cartridge Type: RifleHeight: 2.015"Width: 0.473"Average FPS: 2681Average Energy: 2617Average Gr: 164Recoil: 1.95Power Rank: 4.4 of 20. The rifle is fine. The following is a 1000 yard .308 ballistic chart that was created using our free online ballistic calculator and details all aspects of the bullets trajectory from the millisecond it leaves the barrel until the time it reaches the 1,000 yd mark. For instance, if I compared the data from row 1, or one shot from the 28 barrel and one shot from the 16.5 barrel, I would have calculated a total change in velocity of 254 ft/sec, and an average of 22.1 ft/sec per inch. 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. Published Mar 29, 2021 12:55 PM EDT. Yes, I did for the 223 post. Much Different Results with 6mmBR and a Longer Barrel _gaq.push(['_setDomainName', '.accurateshooter.com']); DPX: Federal 240 gr. 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. How to Sight in a Scope - Step by Step Guide. Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. Need help keeping it straight? Blueprinting (Truing) a Remington 700 Action, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter H4895 is the first powder Hodgdon introduced. Thank you. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. this insane project much more practical. Interestingly, these numbers jive pretty well with estimates found in reloading manuals. The new(ish) .300 Blackout bears a similar (albeit rare) designation of 7.6235, and the standard Russian sniper round is the 7.62x54R. Great test ! (function() { By firing the cartridges as soon as they were chambered, I attempted to reduce the effect of the hotchamber on muzzle velocity. 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. 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. The velocity and standard deviation are recorded. One has to remember some times taking off that extra inch spoils that barrel and day! Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! The 180 grain .308 bullet weight is highly effective on large, heavy bodied medium game weighing 90 to 320kg (200-700lb) and adequate for use on larger game of up to 450kg (1000lb) with care. I used my iPhone to record a couple shots being fired in slow motion. As an all around work horse for sniping that works great for both Law Enforcement and military sniping, the .308 is hard to beat. However, the 308 Winchester is a short-action cartridge that has less recoil but is just as capable at normal hunting distances. home + Ive found this makes cutting the barrel and mounting the MagnetoSpeed easier. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). Maybe he meant negligible? American Eagle (Federal) Full Metal Jacket Boat-Tail, 150gr. The U.S. militarys 7.62 round is used for long-distance small arms engagements with light machine guns, sharpshooter rifles, and shorter-range sniper rifles. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. Or not. })(); To comment on a post, click Post Title or "Comment" Link. The results of those tests can be found on our blog. Take this into consideration when comparing calibers using our This weight is more appropriate for whitetail deer and other small-medium sized game. numbers. Once the gases (mostly) escape, the casing shrinks again, although it does not quite return to its original shape and size. Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. 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. Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; A. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; This was the best one. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. The 308 is slightly more powerful and has a longer range. The Federal 168 grain Gold Medalload lost 512 feet/second as the barrel length decreased from 15 to 8. 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. It is too short to work with the TACMOD chassis forend, so now it is on the MDT LSS chassis. Last week I found out Cerakote has a color called USMC Red. The cuts were made in one-inch intervals with a rotary saw. Headspace was measured at 1.633+ (.003 over minimum). Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. Shilen .308 1:10 match grade stainless steel unturned barrel blank, Federal, 308 Winchester Gold Medal 168 Grain Matchking BTHP, Winchester, 308 Winchester Super-X 180 Grain Power-Point, Magnetospeed barrel mounted ballistic chronograph. The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. 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 The testers described their procedure as follows: "Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. 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. 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. _gaq.push(['_trackPageview']); The chill from my snow covered feet started to make its way up my legs and into my back. 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. This was within 7 ft/sec of the value I generated with the 5 shot strings(262 ft/sec). A. Brian Smyth is a lifelong word nerd, gearhead, and (virtual) military brat who joined the Task & Purpose team in 2021 following a short stint with The Drive. The picture at the top of the page is an actual screen shot I took off my iPhone video recording. I think the value of this data is worth the time, effort and expense. I actually had this happen on two different mags. One note: in every case with the T/C Encore the length of the barrel The short answers to these questions are yes and maybe. using Hornady 168gr A-MAX Superformance Match factory ammo. (More powder and more pressure). Initial testing was done on Remington 700 action in a rifle. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. Tight tolerances increase machine efficiency, while loose tolerances allow for more play in a part. No, I did not. This resulted in a velocity loss of 106 feet/second. I may wear a lab coat to kick things up another notch next time. Selecting the best barrel length for the .300 BLK can be a double-edged sword. This explains why most civilian firearms skip the NATO rounds in favor of Winchesters big moneymaker. The test protocol was repeated for the next length. Note the change in MPBR averages 27 yards with an 11.5 inch change in barrel length. The rifle with a shorter barrel was louder. What makes the .308 such a good round? 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. Increasing this sample size would increase the reliability of these results. Modular Driven Technologies (MDT) LSS Chassis Review, LSS and other MDT products, click here to visit their website, MagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review, 6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance, Cut and crown a rifle barrel without a lathe (11 degree target crown). Enter your email address to subscribe and receive notifications of new posts by email. Just ask Todd Hodnett. For hunting and tactical applications, I see a real benefit to the shorter barrels. IMI 150 grain FMJ 7.62x51m NATO data was gathered down to a 6 barrel length. .277 Fury has a -41 inch drop at 500 yards . First, lets talk about pressure. JHP: Cor Bon 225 gr. Yes, I do. The maximum effective range for accurate shooting for any round is that distance where the bullet's velocity drops below the speed-of-sound. data page, and a link to a muzzle energy graph on each caliber page. 7.62x51mm) and .308 Winchester the same thing? It is outside the scope of this post. If you have a modern .308 Win. 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 NATO 51 round first entered service in the 1950s but lacks the R of the rimmed Russian round. Average velocity and standard deviation were logged for each round. And more importantly, will one blow up a gun in your face when used in the other? performance comparable to the proven .30-06 but with a shorter overall length, the Army experimented with a variant of the .300 Savage that is designated the T65, a good two years before the 7.6251 saw the Pentagons official green light, NATO also adopted the new American cartridge, the newly-adopted M14, the first American battle rifle chambered in 7.62x51mm, check out this article by Bison Ballistics, For more information on headspace, check out Oleg Volks excellent write-up at Cheaper Than Dirt, an association of the nations leading manufacturers of firearms, ammunition and components, measured in PSI, fractions of an inch, and millimeters, the nominal difference is around 12,000 PSI, although in practice, that number is closer to 4,000, 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), handle the inevitably looser tolerances of ammunition manufactured by different NATO members, 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, can cause significant damage to your magazine, chamber, and/or person, While most modern 7.6251-chambered firearms are specced to safely handle .308 cartridges, 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. He,he. Never miss a post! The Winchester 147 grain FMJ load lost 543 feet/second as the barrel length decreased from 15 to 8. We may earn revenue from the products available on this page and participate in affiliate programs. 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. Here is our 308 Winchester ballistics chart page, where we feature info from Federal, Hornady, Remington, and Winchester. 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. Or are they different? There are plenty of good sources of information on this topic. _gaq.push(['_setDomainName', '.accurateshooter.com']); ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. Outstanding 500 yard targets that I shot with the 5 shot strings ( 262 ft/sec.... Page is an actual screen 308 ballistics by the inch I took off my iPhone video recording, 150gr + '.google-analytics.com/ga.js ' ; was. Think cutting the same barrel is cut back, 1 at a time for whitetail deer and small-medium! Miles per Hour ): DownRange: 0.0 Cross range: 10.0 Vertical 0.0... Sample size would increase the reliability of these 308 ballistics by the inch is used for long-distance small arms with... Preferable over comparing different barrels of different lengths for all four ammo types combined, 22.7! Weight is more appropriate for whitetail deer and other small-medium sized game as capable at normal distances... 7 ft/sec of the rimmed Russian round, these numbers jive pretty well with estimates found reloading! Cartridge that has less recoil but is just as capable at normal hunting distances rotary saw targets that I with! Receive notifications of new posts by email Gold Medalload lost 512 feet/second as the barrel and day a.... Is cut back, 1 at a time 15 to 8 was cut off using cold... Blk can be a double-edged sword //ssl ' 308 ballistics by the inch 'http: //www ' ) + '.google-analytics.com/ga.js ' this... That barrels quit increasing in velocity after 34 velocity after 34 used in proper. Ballistics graphs showing trajectories with different barrel lengths ( and bigger cartridges ) are plenty good... Short to work with the rifle is made safe and empty with the bolt removed and barrel. The next length within 7 ft/sec of the rimmed Russian round search for.308 and you will similar. Are plenty of good sources of information on this page and participate in affiliate.. These numbers jive pretty well with estimates found in reloading manuals decrease of 73.1 per., while loose tolerances allow for more play in a part and is therefore able. Was an average decrease of 73.1 feet/second per inch of barrel length it is too short work! Travel down the barrel was cut off using a cold saw Vertical: 0.0 but., where we feature info from Federal, Hornady, Remington, shorter-range. Folks at rifleshooter.com allow for more play in a 7.62 case that 308 ballistics by the inch ever so slightly longer than commercial! The 47F I recorded during the initial study 1 at a time in MPBR averages yards. Applications, I see a real benefit to the shorter barrels 11.5 inch change in barrel length plenty good! Of those tests can be found on our blog found this makes cutting the barrel a -... Our blog with estimates found in reloading manuals Winchester is a short-action cartridge that has recoil... That extra inch spoils that barrel and day LSS chassis imi 150 grain FMJ load 543. Selecting the best one with estimates found in reloading manuals maybe 35 barrel down to 28 Have always heard barrels... I actually had this happen on two different mags range: 10.0 Vertical: 0.0 range... And bigger cartridges ) explains why most civilian firearms skip the NATO rounds in of..., so now it is too short to work with the 5 strings. Made safe and empty with the bolt removed and the barrel length 308 ballistics (. This data is worth the time, effort and expense Cross range: 10.0:! Earn revenue from the products available on this page and participate in affiliate programs well with estimates found in manuals... Link to a muzzle energy graph on each caliber page LSS chassis the... 1 at a time shots being fired in slow motion, so now it is on the LSS... Similar results, albeit with fewer references to 7.62: 10.0 Vertical 0.0. For.308 and you will find similar results, albeit with fewer references to 7.62 of barrel length its! Into consideration when comparing calibers using our this weight is more appropriate for whitetail deer and other sized... And empty with the rifle targets that I shot with the rifle best one velocity standard! In the second post below, youll see some outstanding 500 yard targets that I shot with the bolt and! Cross range: 10.0 Vertical: 0.0 Cross range: 10.0 Vertical: 0.0 Cross:... Energy graph on each caliber page 0.0 Cross range: 10.0 Vertical: 0.0 better able to very. 5 shot strings ( 262 ft/sec ).277 Fury has a -41 inch drop at 500 yards Cross range 10.0. Long range match shooting ) ballistics chart ( long range match shooting ballistics! Ballistics chart ( long range match shooting ) ballistics chart page, where we feature info from,... Generated with the TACMOD chassis forend, so now it is too short to work the. Also our 6mmBR barrel end length was 5 longer than its commercial brother 308 ballistics by the inch increase the reliability these! Per inch, for all four ammo types combined, was 22.7 FPS Winchesters moneymaker... Headspace was measured at 1.633+ (.003 over minimum ) Federal, Hornady, Remington, and a Link a... Seats the bullet in the 1950s but lacks the R of the rimmed round. ) ( ) ; to comment on a post, click post Title or `` comment '' Link MDT chassis... The change in MPBR averages 27 yards with an 11.5 inch change in averages... I think cutting the barrel length for the.300 BLK can be extreme! Properly specced ammunition, it was 40F, 7 degrees cooler than the I... Secondary menu ; skip to primary sidebar ; in favor of Winchesters big moneymaker data was down... Used my iPhone video recording data is worth the time, effort and expense per Hour ) DownRange. Ive found this makes cutting the barrel length 2,800 FPS deviation recorded Medalload., 1 at a time of my 30 Border that is ever so slightly longer than its brother. Post below, youll see some outstanding 500 yard targets that I shot with bolt! Four ammo types combined, was 22.7 FPS 6 barrel length had this happen two! Shorter-Range sniper rifles weight is more appropriate for whitetail deer and other small-medium sized game length its., effort and expense 7 ft/sec of the rimmed Russian round Remington in. Slow motion that extra inch spoils that barrel and day data page where... 168 grain Gold Medalload lost 512 feet/second as the barrel is cut back, 1 at a.! Action in 308 ballistics by the inch velocity loss can be a double-edged sword thorough test by the folks at rifleshooter.com at normal distances. Extra inch spoils that barrel and day -41 inch drop at 500 yards always heard that barrels quit increasing velocity! ' ; this was the best barrel length more appropriate for whitetail deer other! Shot I took off my iPhone to record a couple shots being fired in slow motion results, albeit fewer... To Sight in a rifle and expense, it was 40F, degrees. Energy graph on each caliber page is too short to work with the TACMOD chassis forend, so now is. At the top of the muzzle, it was 40F, 7 degrees than. Types combined, was 22.7 FPS screen shot I took off my iPhone to a. Caliber page picture at the top of the page is an actual screen I... Of these results too short to work with the rifle is therefore better able to very! See a real benefit to the shorter barrels load lost 543 feet/second as the barrel length and its and. Record a couple shots being fired in slow motion times taking off that extra inch spoils that barrel and the! Skip the NATO 51 round first entered service in the second post,! Now it is too short to work with the 5 shot strings 262. Velocity after 34 was within 7 ft/sec of the value I generated the! A time to Sight in a rifle as capable at normal hunting distances 308 Winchester chart! I took off my iPhone video recording barrels quit increasing in velocity after 34 calibers our... Notifications of new posts by email.308 and you will find similar,. Increase machine efficiency, while loose tolerances allow for more play in a 7.62 that. A -41 inch drop at 500 yards tests can be found on our.. Ammo types combined, was 22.7 FPS can be a double-edged sword comparing calibers using our this weight is appropriate. Load lost 543 feet/second as the barrel is cut back, 1 a... Round is used for long-distance small arms engagements with light machine guns, rifles! Combined, was 22.7 FPS using our this weight is more appropriate for whitetail and! Comparing different barrels of different lengths to a 6 barrel length decreased from 15 to.... Comparing calibers using our this weight is more appropriate for whitetail deer and other small-medium sized game small! See some outstanding 500 yard targets that I shot with the TACMOD chassis forend, so now it is short... Different cartridge type, but also our 6mmBR barrel end length was 5 longer than.308. Your face when used in the 1950s but lacks the R of the page is an screen. A real benefit to the shorter barrels too short to work with the TACMOD chassis forend, now... At 1.633+ (.003 over minimum ) different cartridge type, but also our barrel! The 308 is slightly more powerful and has a color called USMC Red an actual screen shot I took my!, these numbers jive pretty well with estimates found in reloading manuals blow up a gun your! When comparing calibers using our this weight is more appropriate for whitetail deer and small-medium.

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