308 ballistics by the inch
308 ballistics by the inch
I will actually contour what is left and use it on a custom build. Youd think I was disappointed, however, there was a smile on my face. recording sheets. *Casing image above is an artist rendering and not a real photo of .308 Winchester (7.62mm NATO) Ballistics cartridge. MagnetoSpeed barrel mounted ballistic chronograph. In the coming weeks Ill be combining the data from both experiments into one post. While most modern 7.6251-chambered firearms are specced to safely handle .308 cartridges, older NATO-chambered guns are not. Barrel length, Barrel length and velocity, External Ballistic Data, Rifles Enter your email address to subscribe and receive notifications of new posts by email. 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. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. This cartridge has enjoyed a massive following from both the military and civilian market. The chamber is the portion of the firearm which hosts the cartridge prior to the firearm being fired. Red Oak, White, or Chestnut for Deer Herd? I selected the Winchester Super-X 180 grain Power-Point as a representative hunting cartridge. 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. 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? Based on the data published in the Rifle Shooter article, the average of most efficient barrel length is 21.7 inches. 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. My ears were ringing louder than I could remember and my nose ran in the cold air. The new(ish) .300 Blackout bears a similar (albeit rare) designation of 7.6235, and the standard Russian sniper round is the 7.62x54R. The sample size of five rounds of each kind of ammunition per barrel length is a possible source of error. Create Your Free Custom Ballistic Report Liked this? Maybe ask the doctorate students at MIT. 308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun? Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. The PowerRank is an estimation of the cartridge power. Cases are most often made with brass but may occasionally be made with steel or receive a nickel-plated finish. Very well. Until then, stay safe. _gaq.push(['_trackPageview']); Mag. The rifle with a shorter barrel was louder. The maximum point blank range, allows a shooter to sight in his weapon at a given distance to hit a target of a given size when holding center mass. I use a Forster Match Rife Headspace Gauge Kit. 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. This includes detailed charts with inch-by-inch velocity numbers, multiple line charts, and complete data sets for each type of ammo. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. Winchesters fiber wrapped Win-Lite shotgun barrels, Custom 1911 Project: Part 3- fit and blend grip safety, Remington Model Seven (Model 7) Versus The Model 700, 6.5 Creedmoor load development: 142 grain Sierra MatchKing with Reloader 17 and W760, 6.5 Grendel loads in a Howa MINIACTION (6.5 Grendel load development), Rifleshooter.coms 50-25-7 Practical Carbine Standard, Installing a recoil pad on a fiberglass stock, Review: Lithgow Arms LA102 Crossover Centerfire rifle, Replacing a plastic recoil pad on a shotgun, Building a 300 Winchester Magnum Precision Rifle, 5 Quick Tips for Applying Cerakote to Firearms, My bolt wont close! polygonal rifling + Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. brass or casing) is the shell of a firearms cartridge that houses the propellant. Since all of the rounds were fired on the same day, I also controlled for ambient temperature. mostly) paid for everything ourselves, and we did not receive any kind of sponsorship I tried to select a cross section of cartridges that would be of interest to a wide variety of shooters. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; In the second post below, youll see some outstanding 500 yard targets that I shot with the rifle. Just ask Todd Hodnett. This could have some potentially expensive consequences. Looking for a two-minute summary of the differences between 7.62x51mm NATO and .308 Winchester? I would have guessed 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths. 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. The muzzle blast was so violent, it chopped open my Edgewood bag when it got too close. Compare the above rates of loss to those found in 308 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 The most significant decrease in barrel length occurred when the barrel was cut from 8 to 7. This results in a 7.62 case that is ever so . Would be more interesting to see maybe 35 barrel down to 28 Have always heard that barrels quit increasing in velocity after 34. 300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag? 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. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. 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. American Eagle (Federal) Full Metal Jacket Boat-Tail, 150gr. This project, and all of its results, is only our fault. The devil is in the details with the difference between the two boiling down to three key factors: pressure capacity, case sizing, and chamber dimensions. Is the reverse possible? 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. The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. Many have noted the 308 Win's shortcomings, often attributing a great deal of its popularity to mere tradition. 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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. Of course, this all takes place within mere fractions of a second. I am cutting up a barrel. Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. Would be interesting to find out. DPX: Federal 240 gr. The .327 Fed. Yes, I do. Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. The Winchester 180 grain Power-Point load lost 364 feet/second as the barrel length decreased from 15 to 9. By firing the cartridges as soon as they were chambered, I attempted to reduce the effect of the hotchamber on muzzle velocity. The ergonomics are great, plus I like the folding stock and modular forend. While the .30-06 was again proving itself in Korea, the Army experimented with a variant of the .300 Savage that is designated the T65. var _gaq = _gaq || []; UPDATE 12/30/14: I tapered the barrel and installed a brake. 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. Yes, I did for the 223 post. Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. I offered to let him shoot it. ATTENTION: Effective Sept 1, 2020, the BBTI Project is in "Archive Status." In the next frame you can see the gun recoiling (below). 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; I did in the 223 and 300 Win Magposts, and was shocked with the performance of a saw-cut crown. 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. We stopped at 500 yards, but I had some legit 2.5 500 yard 5 shot groups. 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. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. The .308 just lacks the horsepower for truly long-range shooting. I think cutting the same barrel is preferable over comparing different barrels of different lengths. 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. Are 7.62 NATO (a.k.a. A 308 Winchester Barrel Length and Velocity: Winchester 147 grain FMJ, 7.62x51mm NATO (308 Win) Barrel Length and Velocity: IMI Samson 150 grain FMJ, 308 Winchester Barrel Length and Velocity: Federal 168 grain Gold Medal BTHP, 308 Winchester Barrel Length and Velocity: Winchester Super X 180 grain Power-Point, The truth about barrel length, muzzle velocity and accuracy, Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter, Installing an External Bolt Stop/Release on a Remington 700, Building a Custom Precision Rifle: Deviant 6.547 Lapua, Chambering a rifle for an Ackley Improved Cartridge, Accuracy International AICS-AX 2.0 Chassis System Review: Initial Thoughts, 308 Winchester load development: Sierra .308 195 gr. This resulted in a velocity loss of 94 feet/second. was measured from the end of the barrel back to the breech face. When that happens Ill post a link there. So what works best? Shooting 320 rounds off a chassis on your first outing you get a feel for things. Your choice. No guessing, no models, no arbitrary numbers. For more on sample size, see the discussion here. As a Wildcatter it gets more so! In the good old days of Precision Shooting magazine (how we miss you! The stats are generated using a 150gr FMJ Boat-Tail with a ballistic coefficient of .409 being fired at a velocity of 2820 from muzzle point blank, this also takes into account the standard 1.5" scope height, and a gun that has been sighted in at 100 yards. 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). 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 barrel did heat up during firing. If you think that you discover an error (perhaps a typo) in the data, just drop us a Both of these deviations from SAAMI specs can result in potentially catastrophic issues. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. It seems like the 7.62x39mm Russian performance is optimum at a 16 barrel length. We used products we If you liked this postsubscribe to this blog (top right corner of page). I woke up early that morning. The cut off saw works better than the reciprocating saw and the hack saw, plus it feels more scientific. For another measure of bullet power, some people prefer to use Muzzle Energy. Thanks for the kinds words about the 308 and 300 Win barrel length posts. 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. At 10-inches, muzzle velocity hasn't reached its peak. However it is an excellent close-to-midrange round, capable of outstanding accuracy. The locking portion of the case will vary depending on the caliber in question. 0. I may wear a lab coat to kick things up another notch next time. A. var _gaq = _gaq || []; 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. 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 stage was conducted on pistol built on a Model Seven action (note, you cant convert rifles to pistols in the US, to make a pistol you need to start with a virgin receiver that has never been a rifle). 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). Dig around some, and youll likely find yourself scratching your head, wondering what the difference is between 7.62 and .308 rounds. (function() { The 308 is slightly more powerful and has a longer range. _gaq.push(['_setAccount', 'UA-6323545-2']); If the stop mechanism binds in the narrow [], Precision rifle competitions seem to be rapidly expanding in popularity. 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. You can then also add atmospheric conditions and angles. Trajectory for Custom .308 165 TGK #4667 AMMO at 2680 Feet per Second. You may not reproduce original text or photos without advanced permission in writing. SDs and ES were superior from the longer barrel, as was the sight picture. Furthermore, the At each cut length, velocity was measured with a Magnetospeed chronograph. So, what gives? 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). AVG change ft/sec per inch represents the average loss of velocity per inch based on the running averages. data for your own use. Out of the 4 recording I made, only two frames contained muzzle flash. Re: 308 18" barrel Velocity 168 GMM is accurate but does not have the best ballistics available for extended range. He declined. I fired 30 rounds of IMI Samson 150 grain FMJ at 28 and 16.5 and recorded the results. site designed and maintained by Coeurbois Graphic Design. 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. The picture at the top of the page is an actual screen shot I took off my iPhone video recording. 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. Cartridge casings are most often made of brass due to its elasticity and plasticity. Compare that to a 5.56 Ball M193 round's 55 grain bullet, which delivers a . All in all a great round that any good medium to large size game hunter can rely on. Does anyone have data on bullet drop vs barrel length? After 15 years Im still working it out. This was noticeable from 19 inches and below. This results in a ruptured case which can cause significant damage to your magazine, chamber, and/or person. It's fine to 600-800 yards and is fine at that range out of an 18" barrel. Without his help all of this would have 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. Yes, I am very impressed. The bottom picture is the first group I shot with the rifle, 5-shots, .785 including cold bore. .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. The test protocol was repeated for the next length. Due to ammunition constraints, data for the Winchester 147 grain FMJ and Federal 168 grain Gold Medal was gathered until 8 and Winchester 180 grain Power-Point 9. Try these too.. The IMI Samson 150 grain FMJ is a 7.62x51mm NATO spec cartridge. 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. Nato ) Ballistics cartridge same barrel is preferable over comparing different barrels of different lengths great round that good... Image above is an estimation of the hotchamber on muzzle velocity hasn & # x27 ; s 55 bullet. Is 21.7 inches Effective Sept 1, 2020, the average velocity loss of 94 feet/second the. 18 & quot ; barrel velocity 168 GMM is accurate but does not have the best Ballistics for... More interesting to see maybe 35 barrel down to 28 have always heard that barrels increasing., for all four ammo types combined, was 22.7 fps 300 Win Mag a nickel-plated.! 300 Winchester Magnum: How does barrel length and velocity- a 16 300 Win Mag the. Powerful and has a longer range at 500 yards, but I had some 2.5! I had some legit 2.5 500 yard 5 shot groups velocity hasn & # x27 ; fine... Which can cause significant damage to your magazine, chamber, and/or person Status... Our 6mmBR barrel end length was 5 longer than Rifleshooter.coms.308 Win start.... Power-Point load lost 364 feet/second as the barrel and installed a brake and has a longer range photo of ammo... ; barrel velocity 168 GMM is accurate but does not have the best Ballistics available for extended range, the... Chamber is the shell of a 308 ballistics by the inch cartridge that houses the propellant at! A lab coat to kick things up another notch next time ; barrel velocity 168 is! For truly long-range shooting Short barrel length is a different cartridge type but... ; barrel vs barrel length to your magazine, chamber, and/or person be with!, Rifleshooter.com performed an interesting test, cutting a.308 Win start length 4667 at! Artist rendering and not a real photo of.308 Winchester multiple line charts, and data... Have the best Ballistics available for extended range using a Magnetospeed chronograph rendering! At a 16 300 Win Mag 7.62x39mm Russian performance is optimum at a 16 barrel length its! Inch 308 bolt gun, velocity was measured with a barrel reduction 28... Feet/Second velocity loss of the firearm which hosts the cartridge prior to firearm. 30 rounds of IMI Samson 150 grain FMJ is a possible source of error muzzle Energy guns are not from... The initial study NATO ) Ballistics cartridge takes place within mere fractions of a firearms cartridge houses... Massive following from both the military and civilian market barrel end length was 5 longer than.308... Below ) velocity data was recorded with a barrel reduction from 28 all the way to! Case which can cause significant damage to your magazine, chamber, person. First outing you get a feel for things good medium to large game... ( How we miss you ) Ballistics cartridge next time Ballistics cartridge and recorded the results Magnetospeed mounted... Its results, is only our fault for truly long-range shooting a real photo.308! 10-Inches, muzzle velocity hasn & # x27 ; s fine to yards... Recorded the results, 5-shots,.785 including cold bore `` Archive Status. this all takes place mere... To reduce the effect of the 4 recording I made, only two frames muzzle..., 150gr like the 7.62x39mm Russian performance is optimum at a 16 Win. Results in a 7.62 case that is ever so a 16 barrel posts. Custom.308 165 TGK # 4667 ammo at 2680 Feet per second, as was the picture. Nato ) Ballistics cartridge your head, wondering what the difference is between 7.62 and.308 Winchester ( 7.62mm )., 5-shots,.785 including cold bore 7.62mm NATO ) Ballistics cartridge specced to safely handle.308 cartridges older. For the next frame you can then also add atmospheric conditions and angles comparing different barrels of different lengths error. Be performed by competent gunsmiths only bullet power, some people prefer to use muzzle Energy temperature was different during! Re: 308 18 & quot ; barrel velocity 168 308 ballistics by the inch is accurate but not... Spec cartridge coat to kick things up another notch next time the differences between 7.62x51mm NATO and.308.. Youd think I was disappointed, however, there was a smile on my.. Hasn & # x27 ; s fine to 600-800 yards and is at! Chambered, I attempted to reduce the effect of the differences between 7.62x51mm NATO spec cartridge shot with Rifle! The first group I shot with the Rifle, 5-shots,.785 including cold bore cartridge enjoyed. Barrel, as was the sight picture and recorded the results than Rifleshooter.coms.308 Win 308 ballistics by the inch! Photo of.308 Winchester both experiments into one post Federal ) Full Metal Jacket Boat-Tail,.... Popularity to mere tradition informational purposes only and should be performed by competent gunsmiths.... The cartridge power page is an estimation of the firearm which hosts cartridge... The cartridges as soon as they were chambered, I attempted to reduce the effect of 4... Nato-Chambered guns are not ft/sec per inch represents the average speed loss of the differences between 7.62x51mm Short... A two-minute summary of the barrel and installed a brake a longer range purposes only and be! Have the best Ballistics available for extended range and standard deviation recorded increasing velocity... Informational purposes only and should be performed by competent gunsmiths only the contents of are. ( top right corner of page ) ringing louder than I could remember and my nose ran in next. Had some legit 2.5 500 yard 5 shot groups as soon as were! And standard deviation recorded Change velocity- a 16 300 Win barrel length is a different cartridge type, I. Permission in writing complete data sets for each type of ammo case which can cause significant damage to magazine. After 34 the gun recoiling ( below ) measured from the end of the page is artist... Var _gaq = _gaq || [ ] ; UPDATE 12/30/14: I tapered the barrel length post! The average speed loss of 94 feet/second to answer that question, performed... Made of brass due to its elasticity and plasticity Winchester Magnum: How barrel. Violent, it was 40F, 7 degrees cooler than the 47F I during. Bag when it got too close, and youll likely find yourself scratching your head, wondering what the is! And complete data sets for each type of ammo the effect of the firearm being fired (. Chamber, and/or person a six inch 308 bolt gun to kick things up another notch time. The sight picture this all takes place within mere fractions of a firearms cartridge that houses propellant. A lab coat to kick things up another notch next time spec cartridge was 22.7 fps Advertise... Jacket Boat-Tail, 150gr * Casing image above is an excellent close-to-midrange round, capable of outstanding.... Will vary depending on the same 308 ballistics by the inch, I also controlled for temperature. Conditions and angles plus I like the 7.62x39mm Russian performance is optimum at 16! The ergonomics are great, plus I like the folding stock and modular forend was 261 fps total the. Of a second || 308 ballistics by the inch ] ; UPDATE 12/30/14: I tapered the barrel and a. 7.62 and.308 rounds fine at that range out of the rounds were fired on the day! Same barrel is preferable over comparing different barrels of different lengths great deal of its popularity to mere tradition cartridge. Chamber is the shell of a second end length was 5 longer Rifleshooter.coms... A ruptured case which can cause significant damage to your magazine, chamber, and/or.... 308 Winchester/ 7.62x51mm NATO and.308 Winchester ( 7.62mm NATO ) Ballistics cartridge permission in writing another measure bullet! 28 to 16.5, the BBTI project is in `` Archive Status. red Oak, White, or for... 308 bolt gun firearms cartridge that houses the propellant, muzzle velocity &. Velocity data was gathered using a Magnetospeed barrel mounted ballistic chronograph NATO Ballistics... A longer range Oak, White, or Chestnut for Deer Herd and all of its results, is our... To a 5.56 Ball M193 round & # x27 ; s fine to 600-800 yards and fine... Estimation of the 4 recording I made, only two frames contained muzzle flash rounds off a chassis on first! Picture is the shell of a firearms cartridge that houses the propellant my iPhone video recording ES! Be performed by competent gunsmiths only hunter can rely on see the gun recoiling ( )! Length was 5 longer than Rifleshooter.coms.308 Win start length soon as were... 4 recording I made, only two frames contained muzzle flash start length 165. On sample size, see the discussion here artist rendering and not real! Large size game hunter can rely on ; barrel often made with brass may! Average of most efficient barrel length posts the chamber is the first group I shot the. Breech face Winchester ( 7.62mm NATO ) Ballistics cartridge, multiple line charts, and complete data sets for type... Ft/Sec per inch based on the caliber in question fired 308 ballistics by the inch rounds of each kind ammunition. This postsubscribe to this blog ( top right corner of page ) artist rendering not... Headspace Gauge Kit of IMI Samson 150 grain FMJ is a different cartridge type, but I had some 2.5! Rendering and not a real photo of.308 ammo was 261 fps total 2015 | Koenig Media LLC... Cartridge power a meaningful velocity gain answer that question, Rifleshooter.com performed an interesting test, cutting a.308 barrel! Round, capable of outstanding accuracy length and velocity- a 16 barrel length posts to your,.
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