I dont think you can get there in 9 inches with full-size powder loads regardless of how fast-burning they are. As for silencers, either wait for the SIG SAUER cans to come on the market or get yourself an AAC MG-SD. Affordable Factory 300 BLK Ammo is Available. The 220 grain subsonic .300 Blackout goes at about 1010 feet per second with 500 foot-pounds of muzzle energy. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. Barrel twist rate also impacts performance and should be considered when selecting barrel length and determining the effective range of the 300 Blackout. Planes that increase their velocity until it reaches and exceeds that mark generates a sonic boom. I doubt you would get extra wear and tear from using supersonic ammo in it. 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. 300 Blackout SAAMI Cartridge Specification. I dont know much about ballistics, but wouldnt the higher velocity associated with a longer barrel mean less bullet drop over longer distances, thus increasing accuracy? The .300 AAC Blackout is designed as a variation of the older .300 Whisper ammunition. Now that you know the best barrel length for .300 Blackout ammo, you only need to find where to buy a barrel that fits your needs. In theory, a longer barrel offers more room for bullet expulsion. Better question still. Some folks wonder why consider a 300 BLK? Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. Really -- the largest difference is barrel length. The Sporting Arms and Ammunition Manufacturers Institute (SAAMI) approved and published industry standards and specifications for the .300 BLK on Jan. 17, 2011. The 300 Blackout round is an excellent choice for home defense as it combines power and efficiency with lethality when fired from a short-barreled rifle. Niche it may be, but it is exceptionally useful in that niche. Notify me of follow-up comments by email. Been there, done that. The 300 Blackouts .30 caliber bullet can be made especially long, and as the result may weigh up to 220 grains quadruple the weight of the typical 223 Rem rounds. Shorter barrels do not result in less accuracy. There was an article on TTAG maybe a year or so ago comparing velocity loss from from a 5.56 16 vs 10 and a 300BLK from 16 to 9. Affordable Factory 300 BLK Ammo is Available. To counter this, of course, there is always the option of sticking a silencer onto the muzzle. The case heads are identical on 223 Rem and 300 BLK ammo, which makes the bolts on both interchangeable in many cases. With a 1-7 twist rate, for instance, it means that the bullet will be spun once over 7 inches of rifling. Although the 300 Blackouts effective range depends on the shooter and application, the chart above provides rough guidelines for consideration. I make my living building high end audio equipment, I cant afford ear damage. There have been a number of Kabooms recorded from 300 BLK rounds fired in a .223 Rem/5.5645 chamber. We refer to it as one rotation over a particular inch of barrel. Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. Best Barrel Length For Suppressed 300 Blackout For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. I dismiss this entire article as slow news day page filler. In short, barrel length arguments or advice are pretty worthless in comparison to having actual mathematical data and testing. 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. Yet this unnamed writer says thats incorrect, and the optimum is at 16. As for waiting on Sig Suppressors good luck with that. They straight stole J.D. Even though it is short, a 6-inch barrel can generate enough velocity to hit close-range targets. CQB isnt a place where bright flashes coming out of a barrel are an advantage, so using a 22-inch tube wont help much, if at all. The .44 Mag is well known for picking up considerable velocity from a carbine. Any discussion on the effective range is a minefield full of opinion best tiptoed over by indicating those figures make the .300 BLK at 300-yard shot territory most comfortable for veteran shooters. 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. A 9 inch barrel is definitely a handy length, but it is certainly not the fastest. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. This issue isnt unique to 300 Blackout bullets, though. The only thing that barrel length gets you is velocity the longer the bullet is in the barrel and being pushed by the expanding gasses of burning gunpowder, the faster that projectile will be going. Nothing further than that is as effective since the gunpowder burning would be inefficient in the spare room. According to Advanced Armament Corp the entity that developed the .300 Blackout cartridge its optimized for a 10 barrel with suppressor. That coupled with your complaints is why. 7.62 has a wider casing and requires different size magazines along with a different bolt. Ed My purpose is close quarter confined space self defense, not hanging out a helicopter shooting wild boar, although that sounds like a helluva lot of fun. Bullet drop is calculable, though, so that should really fall under marksmanship, as opposed to intrinsic accuracy of the rifle? And now for the killer..I dumped ALL my 5.56 stuff, all of it including the progressive press set up just for it, and went full in on 300 BLK. The Harvester is a great suppressor. While I can see Nicks point in preferring screw on suppressors over fast attach systems, there are reasons why the fast attach is superior in some cases. Suppressors minimize the chances of a sniper being located by sound, but they simply reduce audible emissions from their firearms muzzle end, not a projectiles characteristic crack. To avoid it from giving a shooters position, subsonic .300 BLK loads use heavier bullets and adjusted powder chargesoften tailored for a complete burn in a short barrel. Granted, revolvers have a barrel / cylinder gap, but that is a separate issue. 2) would you build again with the same silencer? That did more to spark interest in NFA items than anything. 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. or youll solve them. I wonder, though, whether people ascribe greater accuracy to a longer barrel, thinking longer barrel = straighter trajectory, when really its that longer barrel = greater velocity, which in turn implies less susceptibility to random wind movements? The companies didnt start completely from scratch, though. WebThey found the optimal barrel length for 300 BLK is between 9" and 11.5". You forgot one thing in your calculation powder quantity. WebThey found the optimal barrel length for 300 BLK is between 9" and 11.5". The 300 BLK shoots .308 caliber bullets. Perfect for integral suppressor or just using as an SBR/pistol. For example, a 1:8 twist is best for lightweight supersonic rounds, while the 1:7 twist is recommended for heavy subsonic rounds with a suppressor. Designed specifically for 300BLK and 7.6239, rated for .308 WIN in 16 or longer barrels. Any insight on following: Most bullets from both cartridges weigh around 125-Grains. We do not recommend choosing a shorter option because the barrel will not be long enough to sufficiently burn gunpowder and provide maximum force to propel the bullet from the muzzle. As a testament to the efficiency of the .300 AAC Blackout, several military units across the world, including the Netherlands, United Kingdom, and the United States, have adopted it. WARNING: With some bullet options (and setback during chambering) 300 Blackout rounds will go into a .223 chamber and fire. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. Best Barrel Length For Suppressed 300 Blackout For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. It is ear safe with subs and damn near it with supersonics. The development of the .300 Blackout was a joint effort between AAC and Remington Defense, and this was to produce a replacement for the 5.56 NATO. The .300 Blackout is a worthy firearm since it gives you the ballistic power of an AK just by switching the upper in an AR. Some powders should not fill the case because of their density and overpressure problems with that much powder. Products manufactured by 80% Arms carry a lifetime warranty against manufacturing defects. The 300 Blackouts .30 caliber bullet can be made especially long, and as the result may weigh up to 220 grains quadruple the weight of the typical 223 Rem rounds. Just more satisfying to me than a real press. You can blow up your gun and sustain serious injury. . BA, Rosco, WC, and others have all worked immediately without any specialty tuning. So would a better/different suppressor. OUR GST-9 IS UNAFFECTED BY THE LATEST 12/28 ATF CLARIFICATION LETTER & SHIPS IN 3 DAYS! PWS is as close as you can get right now. The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. Nobody shows pics like mine because it was not big dealnothing to talk about. Mine has a 10. For 5.56 NATO, that point is 20 of barrel. You have entered an incorrect email address! SOCOM 7.62 Mini suppressor. Important correction Mr. Leghorn: the SilencerCo Harvester suppressor provides about 30 dB of suppression according to your graphic, not 40%. A 6-inch .300 Blackout barrel is short enough to carry as a concealed weapon, and drawing and aiming the reasonably sized weapon is hassle-free. Then, you can fine tune your load to the harmonics of the barrel you are using. Results are in inches/foot-pounds of energy and based on a 100-yard zero with the scope 1.5 inches above the bore. The point is, based on the design parameters of the 300BLK round while you do get more velocity from a longer barrel the % increased velocity per inch increase in barrel isnt as much as with say a 5.56. The best option is one that youre not going to like: wait. For longer range engagements with a suppressed 300 Blackout, use a 16 barrel with a suppressor for an average velocity of over 2,630 fps, leading to more effective shots and minimal bullet drop. For the best experience on our site, be sure to turn on Javascript in your browser. Everything from .22lr to subsonic .308 Winchester, and even 5.56 NATO from a 16 barrel. It is a niche gun not even available to the public. In instances where that is not an option, however, you can always go long or brace yourself for those loud blasts with every shot. Then you can also pick a slightly faster burning powder to get a complete burn in 16 of barrel. By design, the 300BLK just doesnt give up that much velocity until you get down below 9-10 of barrel using factory ammo. All the links go to Faxons website. The subsonic capabilities of the 300 BLK make it ideal for use with a suppressed AR. 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. At 16 inches, .300 Blackout barrel muzzle velocity is close to its peak, giving you a powerful weapon for making accurate long-range shots. Compared to other bullets, a .300 Blackout is a 30-caliber bullet in a .223/5.56mm shell casing. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. Accuracy is hard to figure.I have a real 25 yd range and with the red dot thing on it it stuffs all loads into a ragged hole but the point of impact does vary between them. Mike: I cant seem to edit my comment. The kissing cousins resemble twins at a distance, but the similarities end at projectile girth. Here are answers to common questions asked about .300 Blackout barrel length: The length of a .300 Blackout barrel affects accuracy in several ways. The .300 Blackout's rather streamlined shape allows for it to have magazines with minimal curvature, which makes them less prone to jam. I was amazed at myself. The article is a little wordy but does a decent job of explaining that the best barrel length depends on what optimal performance means to you. You are incorrect on one critical detail: Adding more barrel length after that point might still increase the velocity a bit, but the added weight isnt always worth the extra dollop of velocity.. how much difference in sound is between a 30-30 and a300black out with a can on it. At a mere 200 yards with a 100 zero, the 300 Blackout drops nearly 5.5 inches more than the 5.56, at 300 yards it drops a whopping 19-inches more. Chamber erosion, out of battery detonations in < 2k rounds, most of them. It could, if youre hand loading. On a gun you plan to carry, super heavy barrels are not ideal. The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. The .300 Blackout also comes in a supersonic variant, which means once fired, the bullet travels faster than the sound barrier. It depends on the intended purpose of the rifle. When an object travels faster than the speed of sound and breaks the sound barrier, it generates a sonic boom. Velocity will increase as long as there is sufficient pressure behind the bullet to accelerate it. Supersonic bullets travel fast enough to generate sonic booms, and the resulting noise gives even suppressed gunshots a loud "crack.". My .308 and my 300 BLK are both capable of pushing the same size bullet, but the .308 has way more space in the case for powder than does the 300 BLK. A look at 300 Blackout ballistics including velocity, energy and drop data for some of the most popular loads among American shooters. Really -- the largest difference is barrel length. *Calculations are estimates using Hornadys on-line ballistic calculator and adjusted by the companys estimate of between 25 and 35 fps loss per inch of shortened barrel length (30 fps subtracted per inch for the purposes of this chart).