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The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. It too functions with all loads I have. I hope it will post. Compared to other bullets, a .300 Blackout is a 30-caliber bullet in a .223/5.56mm shell casing. I then hit it 15 times in a row. Suppressor-Friendly: You can shoot heavier bullets subsonic. 300 AAC Blackout What happened to it will fire from any AR-15 you might have doesnt appear to be the case since now you say a 9 barrel is optimal but which would require an SBR $200 stamp, you may need an adjustable gas block to handle over gassing & shoot subsonic and then theres the ammo is twice the cost what I pay for my 556 rounds.. My interest in building a 300 AAC for hog hunting that I could just slap in my upper is quickly deteriorating, especially since the gun may not even cycle without, additional hardware if you want to what was promised, which is shoot both supersonic and supersonic through a stock 16 barrel. This is why target shooters prefer short fat barrels they distort less under heat and cool faster. despite the short barrel. It also has a great barrel life, which means it can go for long periods and operate effectively under varying conditions. If thats a factor, then it would maybe only come into play at great distances? AR-platform rifles optimized to run subsonic 300 Blackout tend to fire supersonic ammo poorly. JavaScript seems to be disabled in your browser. Though the .300 Blackout was designed to offer the best results in close-range targets, you can use it for long-range targets as well. Handloading the .300 AAC Blackout Would a shorter barrel make it quieter? At 10, the muzzle velocity hasnt yet reached its peak. Since suppressors are verboten in CA, I shoot 120g supersonic. Nine inches of barrel will give you the perfect balance of light weight and velocity with the 300 BLK cartridge. Wondering if you know if theres a significant advantage in range with a 10.5 (both sub and super-sonic). The .300 Whisper developed by J.D. The .300 Blackout is quite effective when hunting for animals like wild pigs, deer, or varmint. One for the M16 regardless of barrel length. Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. My friend bought a 300 Blackout upper from PSA and put a can on it. 300 HAM'R Hey, man. Supersonic bullets travel fast enough to generate sonic booms, and the resulting noise gives even suppressed gunshots a loud "crack.". 300BLK Barrel Length & All Things 300 Blackout Answered Heavy grain subsonic bullets are barely able to retain true subsonic performance. 300 Blackout Ballistics I think problems with any firearms are possible and the worst will show up on the internet (like snake and spider bites) because folks need help but its probably the exception not the rule! The barrel should also deliver enough bullet velocity to hit far-off prey with deadly impact. The 300 AAC Blackout definitely works for hunters who want to use their AR15-platform rifle. Dennis- 300 BLK starts with a 5.56 casing that they neck down much shorter, allowing for a wider and longer bullet that can now weigh significantly more than any 5.56 can. 300BLK supers wont touch the 6.8SPC in a carbine length or longer barrel, and if you dont plan to suppress or run an SBR is just a way better choice. Great! For those who need to run a .30-caliber cartridge from a standard AR15 platform (as opposed to the AR10), the 300 AAC Blackout makes sense. All you need is a bigger diameter barrel. A mystique surrounds the .300 BLK (AAC Blackout), and it overshadows this utility players ability to deliver All-Star numbers in a variety of roles. Its the pressure of expanding gas behind the bullet that accelerates it, and it doesnt fall off at 9. They instead heavily based their new cartridge on SSK Industries 300 Whisper. The Hornady Sub-X 190-grain load, for example, exits the muzzle of a 16-inch barrel at 1,050 fps, where it is carrying 465 foot-pounds of energy. A longer barrel has a slower twist rate and provides more power and accuracy, which is better for long-range targets. Only specific barrel and ammo testing will tell, though. BBTI - Ballistics by the Inch :: Home Granted, revolvers have a barrel / cylinder gap, but that is a separate issue. A faster bullet requires a different twist to stabilize I think, and if the twist is too fast the bullet will sail like a kite instead of soaring, but its true the faster bullet will be flatter trajectory, and flatter can feel like accuracy for most people who dont want to adjust for elevation. Have an 8.2, 10.5 and a 16.0 inch. For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. Here are answers to common questions asked about .300 Blackout barrel length: The length of a .300 Blackout barrel affects accuracy in several ways. So in the case of .308, the longer barrel makes sense (at least 16 inches is needed to get full powder burn) because of the greater powder quantity. Good follow up to your other posts on 300 black. The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. They designed it for the needs of Special Forces to be real compact (as an Mp-5) and QUIETER than an MP-5. BA, Rosco, WC, and others have all worked immediately without any specialty tuning. Please tell us more about how awesome it is. No one mentioned differences between polygonal rifling vs lands&grooves . Results are in inches/foot-pounds of energy and based on a 100-yard zero with the scope 1.5 inches above the bore. Barrel Length Its an ad. Cartridge Overall Length: 2.02 inches. Just a tiny bit louder but shorter and lighter is the versatile Silencerco Omega. 300 HAM'R I was under the impression that accuracy needed to match bullet weight, (already mentioned), barrel length (also mentioned), and type of powder used. What failed exactly? Having a longer barrel also provides more time and surface for the bullet to stabilize from the point of firing to the point where it exits the muzzle. 7.62 has a wider casing and requires different size magazines along with a different bolt. In a 16 supersonic only AR there are vastly superior caliber choices like 6.8SPC. It probably worked loose after multiple shots, and somebody forgot to tighten it back up. WebSince we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. We utilize state of the art 5-axis CNC machines to mill all our .308 and AR-15 80 percent lower receivers to incredibly precise tolerances using premium billet aluminum. WebIn matters of velocity comparison, different barrel lengths for the .300 Blackout sit within the 25-50 feet per second per barrel velocity rule that governs most firearms. Whether you decide to go long or short on your barrel is entirely a matter of what you are shooting at and where the shooting is taking place. That number comes from multiple conversations with the people who designed the 300 AAC Blackout cartridge, did the initial testing, and who continue to design guns around that caliber. Even so, 1:7 isnt terrible. The long Sig Titanium 7,62 is REALLY quiet. The 300 Blackout would never see mainstream military use, although it became popular in the civilian shooter market. If the .300 BLK is good enough for the U.K. and U.S. military, its more than enough for home defense. Selecting the best barrel length for the .300 BLK can be a double-edged sword. 300BLK Barrel Length & All Things 300 Blackout Answered While you can have a 9-inch .300 BLK barrel pistol, the best barrel length for .300 Blackout pistol is 6 inches. Some powders should not fill the case because of their density and overpressure problems with that much powder. A 16-inch barrel ensures complete gunpowder burning to fire rounds with maximum force. A 125 gram .300 BLK bullet fired from a 16-inch barrel has an effective range of about 500 yards , while the same ammo shot from a 9-inch barrel has an effective range of about 480 yards. This will make sighting to that farther distance simpler. You forgot one thing in your calculation powder quantity. (function() { Share the post "300 Blackout Basics Specs and Cartridge INFO", Tags: .223 Rem, .300 AAC Blackout, 300 BLK, AR15, Lapua Brass, Suppressor. The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. However, the stainless steel core will eventually wear out from too much full-auto fun. It will also be fitted with an Omega can. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; John McClain, *Competitive Shooter of the Week* Copyright Ammotogo.com 2023 All Rights Reserved. You have entered an incorrect email address! And it is VERY quiet AND compact. Best twist rate for 300 Blackout? For 5.56 NATO, that point is 20 of barrel. It was state of the art just a few years back. https://en.wikipedia.org/wiki/.300_Whisper. To add Im also a lefty so want to manage the gas as much as can be done. Three? I would look into making/getting a telescopic suppressor (reflex design). I also note that this info is hard to find anywhere else, boiled down to what works, for the average guy based on a lot of industry insider info- and trying different things, and that is all you, Nick, and TTAG. At 300, holdover is only 23.4 inches. Best Barrel Length For Suppressed 300 Blackout For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. I was amazed at myself. The stability provided by the long barrel will help the bullet fly on a flat trajectory and increase its likelihood of hitting its target. The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. I completely agree with the SDN-6, I have one too but like everything else, buying a can is a moment in time and you get what you get. Even the bolt stays the same, and all that changes is the barrel. CLICK HERE for more information. Don't believe in them, and never will. 300 Blackout Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. Muzzle Velocity: 2,259 fps. Definitive Guide to 300 Blackout vs 300 Blackout (with ballistics charts The .300 AAC Blackout is designed as a variation of the older .300 Whisper ammunition. Most bullets from both cartridges weigh around 125-Grains. Hunting, home defense, and competition style shooting, the .300 AAC Blackout does it all. The 9 300 blackout barrel is the best overall barrel length with or without a suppressor, especially since an 8 barrel is the minimum warranty barrel length for many suppressor manufacturers. 300BLK vs. 5.56? Damn was my arm sore on the 7th day, so I rested . The 300 Blackouts recoil is not significantly different from the 5.5645, and its price isnt prohibitively higher. With a 20-inch suppressed barrel, you can achieve a bullet velocity of over 2,630 feet per second (fps), leading to more impactful shots and reduced bullet drop. Note that they used exactly the same twist on the TT30 and TT33 auto pistols and millions of SMGs chambered in 7.62 x 25. If it's inside your house in home-defense scenarios, a short barrel will allow for better maneuverability. Subsonic .300 Blackout rounds fix this problem by traveling slower than the speed of sound. This isnt that hard. .300 BLK ammo fired from a short barrel can hit targets at 100 yards, which is more than enough range for home defense. Remington now sells a variety of 300 BLK ammo: 1) 125 grain open-tip match with a custom Sierra bullet; 2) 220gr subsonic, and 3) 125gr AccuTip (photo below). Greater velocity, if the longer barrel enables such, leads to a farther maximum point blank range. The military roots still show in the selection subsonic loads, although its neighborly friendly to ditch that familiar crack as the bullet breaks the sound barrierwhether its quieted at the muzzle by a suppressor, or not. One important consideration before you set out to build your AR-15 in the .300 Blackout is knowing the scope of usage of your gun. For instance, having a relatively long barrel has the gases from the already burned-out gunpowder trapped for longer, which means there will be more push time of the bullet by the gases. Thats water weight capacity. Though the muzzle rise and recoil forces are not entirely negligible, they are not enough to affect follow-up shots for the shooter. Just more satisfying to me than a real press. The only real question is what twist rate to go with. For instance, the nine-inch barrel has a 100-inch drop at 410 meters, while a 16-inch barrel has a drop of a 100 inches at 440 meters. For 300 AAC Blackout, that point is 9 inches of barrel. Higher velocity results in less drop at longer ranges, which of course effects point of impact. Velocities over my 9 AAC barrel are surprisingly mild, about 30-40 FPS for subsonic and about 100 FPS for supersonics. A big boom, and a really big flash, sounds like fun, when fun is the goal, anyway. 300 Blackout is taking the shooting world by storm, and for good reason. Did you get it repaired? But its the opposite with the 300 AAC? TKS! Let your fellow shooters know share this article using the Facebook, Twitter and other social media icons below. _gaq.push(['_setAccount', 'UA-6323545-2']); Great Barrel Life: With a .30-caliber bore and a modest powder charge, barrel life is outstanding. This high-speed feature means that the bullet will spend relatively less time in motion and thus less prone to the effects of elements like the wind. Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. Able to suppress all rifle calibers up to and including 300 Winchester Magnum, its perfectly at home on the 300 BLK rifle offering about 40% sound reduction. The twist rate is when the bullet twists within a barrel once fired, which helps keep it at a high velocity and helps maintain accuracy. The chief difficulty in accurately firing 300 Blackout comes from learning to accommodate its pronounced bullet drop. Why would you detach your suppressor for supersonic ammo? Could you comment further on the ratchet latch on your SDN-6 failing? In large part because of PSAKs being very dangerous garbage until very recently. For those looking for a rifle can and not worrying about rimfire or pistol calibers, the SilencerCo Harvester is perfect. In instances where that is not an option, however, you can always go long or brace yourself for those loud blasts with every shot. Based on feedback from shooting experts, the best barrel length for .300 Blackout suppressed is 8 to 10 inches. The .300 Blackout also comes in a supersonic variant, which means once fired, the bullet travels faster than the sound barrier. The 30 BR is expected to shoot sub .5 MOA out to 300 meters and weight is at a premium for most of these guns. Versions include FMJ, with or without boattails, open tip match or open tip flat base and cartridges with Hornadys SST V-Max, Sub-X or hollow points. Since the paperwork and tax didnt kill you, and they already have your fingerprints, youre gonna want to SBR it. Longer barrels are not automatically more accurate. Pick the barrel length (or performance target) you want and build a load around it then you can come up with some educated rules-of-thumb of your own. There have been a number of Kabooms recorded from 300 BLK rounds fired in a .223 Rem/5.5645 chamber. 300 Blackout It is cross-compatible with. For example, if you shoot the same Hornady Sub-X 190-grain load from a 16-inch barrel, it will drop 33 inches at 200 yards a 14-inch improvement over shooting with a 10-inch barrel. I strongly suspect thats where this comes from. You would have to cut down and make your OWN 6.75 barrel since SIg will not sell you one of theirs. . A higher velocity will help a bullet fly with more power and speed, increasing how far a bullet can travel before gravity pulls it off its trajectory. The AAC uses a similar weight and dimensional bullet as a 30BR and 20 inch barrels and longer are the standard for those highly accurate bolt guns. 300BLK vs. 7.62x39? Fortunately, you dont have to look far. Keep reading to discover the best barrel length for .300 Blackout for different shooting scenarios. However, a 20+ inches barrel may be too unwieldy and impractical for anything but target shooting. Instead, they built the round from the M4-compatible 5.56mm cartridge. Ask Foghorn: What Barrel Length for var _gaq = _gaq || []; The other had an issue with the gas block; I contacted PSA and they immediately fixed it at no charge and with no questions, and it also has run perfectly since then. Versions include FMJ, with or without boattails, open tip match or open tip flat base and cartridges with Hornadys SST V-Max, Sub-X or hollow points. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel. A 9 inch barrel is definitely a handy length, but it is certainly not the fastest. Affordable Factory 300 BLK Ammo is Available. This issue isnt unique to 300 Blackout bullets, though. But barrel length can significantly impact your firearms performance. Really -- the largest difference is barrel length. A successful hunt requires sneaking up on a target until you're close enough to take a clean and fatal shot. Its really hard to find data on accuracy down-range with different lengths and types (prob just go with AAC as they seem well respected, but would really like to find the most accurate nitrided barrel made).