SAAMI creates and publishes industry standards for safety, interchangeability, reliability and quality, as well as coordinates technical data for agencies, enthusiasts and manufacturers. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel. I have a Sig red dot on my 556 upper and a 4-1240 Bushnell scope on my 300. Have been shooting 300 for a few years now. Remington Defense was part of the effort, which was no easy task because it included a requirement that it run in standard AR-15 magazines. 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. For 5.56 NATO, that point is 20 of barrel. 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. I posted this but deleted it. These loads are heavier than most rounds and feature an adjusted powder charge that delivers peak bullet velocity by combusting completely within short barrels. The 300 AAC Blackout was created by Advanced Armament Corp. and Remington primarily for the military as a way to shoot .30-caliber bullets from the M4/AR15 platform while using standard magazines. In the chart, Hornady 110gr G-Max Full Boar (2,350 FPS At Muzzle), Hornady 125gr HP American Gunner (2,175 FPS At Muzzle), Hornady 190gr Sub-X Subsonic (1,050 FPS At Muzzle), *Competitive Shooter of the Week* While you can, that is. 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. 1) Barrel length? There is obvious powder burn outside the barrel which is clearly visible on video. Out of a cold unit, you will always have a flyer, usually the first shot. As a result, heavy-grain subsonic bullets struggle to retain their subsonic terminal performance, while supersonic ammo has increased effective range and reduced bullet drop. This is why target shooters prefer short fat barrels they distort less under heat and cool faster. Easy Conversion: Use your current AR lower, bolt/carrier, buffer, and magazine. You forgot one thing in your calculation powder quantity. Great Barrel Life: With a .30-caliber bore and a modest powder charge, barrel life is outstanding. The barrel should also deliver enough bullet velocity to hit far-off prey with deadly impact. I was at first considering a 9" barrel with a 1:7 rifling, for that is what the cartridge was designed around. 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. Even at 300 yards holdover is nearly 9 feet. A 9" barrel will allow any 300 BLK cartridge to reach optimal velocity, while an 11.5" barrel will provide a bit more accuracy and stability if you plan on shooting mostly supersonic loads. I dismiss this entire article as slow news day page filler. 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. Avoiding the logistical nightmare that would have been to replace the military's standard issue rifle during an ongoing war, the .300 Blackout was designed to be compatible with the M4 system. 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. That coupled with your complaints is why. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. 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. Velocities over my 9 AAC barrel are surprisingly mild, about 30-40 FPS for subsonic and about 100 FPS for supersonics. Standardized with SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) specs means every design aspect of the .300 Blackout is kept similar, regardless of the manufacturer. AAC didnt develop a damned thing. Visit us today to browse the .300 Blackout barrel lengths. If you start with wanting a suppressed gun, you will eventually get to the 300. Don't believe in them, and never will. These days, #1 on my list, especially for new silencer owners, is the Liberty Mystic-X. We also offer our patented AR-15 and .308 Easy Jigs which is the first 80% lower jig that makes it ridiculously easy for a non-machinist to finish their 80% lower in under 1 hour with no drill press required. 300BLK vs. 7.62x39? how much difference in sound is between a 30-30 and a300black out with a can on it. Accuracy differences would be more apparent in supersonic loads where the transition from supersonic to sonic happens before the target. Buy a .308 from a legit company and save yourself headaches. How to Assemble and Use the GST-9 Infinity Jig. Our initial research data covered the relationship between barrel length and velocity for some 13 common handgun calibers/cartridges. A longer barrel, because of its increased surface area, provides more room for cooling in instances where you shoot continuously. Copyright Ammotogo.com 2023 All Rights Reserved. Plus, the long barrel compensates for its rather laborious maneuverability. Nothing further than that is as effective since the gunpowder burning would be inefficient in the spare room. Therefore, long range .22LR shooters stick to subsonic ammo in order to avoid the sound barrier transition. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. Though there is a lot of talk among gun enthusiasts about the nine-inch sweet spot of barrel length when it comes to the .300 Blackout, the ammo works well with different variations of barrel lengths and uppers. You can blow up your gun and sustain serious injury. Better question still. The well-known terminal performance of that Sub-X bullet, however, does make the load an ear-friendly option for some who hunt at relatively short distances. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); So many thanks for your article and any advice you can give. Now its a chicken and egg thing. COPYRIGHT 2021, THETRUTHABOUTGUNS.COM. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. From there it really degrades. Greater velocity, if the longer barrel enables such, leads to a farther maximum point blank range. Clickhereto browse previous posts]. That did more to spark interest in NFA items than anything. All you need is a bigger diameter barrel. 7.62 has a wider casing and requires different size magazines along with a different bolt. For an MG with a sub 16 barrel and a suppressor, you only need two stamps, one for the suppressor and one for the MG. Two. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. .300 Blackout Guide: Best Barrel Length, Build Tips & More. The longer the barrel, the greater the tendency for it to move while firing imparting a POA-POI shift. 9 AAC 1:7 melonite barrel is the best Ive tested. Advanced Armament Corporation (AAC) started working on the cartridge in 2009 after a U.S. military organization requested the development of a .30-caliber round capable of running in an M4. That typically occurs in much longer barrels that are commonly in use. Personally, if I had to do it all over again, I would definitely not go with a 762-SDN-6. The powder needs not only fully burn, but also the products of said burning need to drop in pressure, before you start seeing a decrease in velocity. Longer barrels also screw up the timing, 16 with carbine gas is on the outside fringe of reliable for the 300. And the stellite core will be much more durable than the Harvester (and probably what Sig will come out with). The barrel's length also allows the bullet to stabilize before exiting the muzzle, leading to a flatter trajectory and better accuracy. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; Your longer barrel does add minimal velocity. A 9" barrel will allow any 300 BLK cartridge to reach optimal velocity, while an 11.5" barrel will provide a bit more accuracy and stability if you plan on shooting mostly supersonic loads. However, heat build up effects point of impact. Longer barrels are not automatically more accurate. According to Advanced Armament Corp the entity that developed the .300 Blackout cartridge its optimized for a 10 barrel with suppressor. And of the couple dozen barrels Ive used in builds, only Faxons have given me fits with under-gassing (suspected out of spec gas port). They first looked to the 7.6239 for inspiration. On a gun you plan to carry, super heavy barrels are not ideal. The 300 BLK shoots .308 caliber bullets. Selecting the best barrel length for the .300 BLK can be a double-edged sword. If you're looking for a multi-purpose load for the .300 AAC Blackout, this may be the best bullet. That is your shortest, lightest choice that will give you a tiny snap snap like a loud claparound 119-121 db. The fastertwist rate is perfect for the 220 grain ballistic monsters that subsonic 300 BLK ammunition use, but for the lighter hunting rounds (like Barnes 110gr round) not so much. But double taps on steel from 100 yards with subs is. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. My guess is your luck will be like mine. 2) would you build again with the same silencer? Regardless of the position it plays, the .300 BLKs performance often hinges on finding the best barrel length and load combination for the distance you have in mind. Attaching a 6 suppressor to this barrel length results in a total length of 14 to 16, which provides optimal muzzle velocity for accurate long-range shots. 300 Blackout SAAMI Cartridge Specification. Results are in inches/foot-pounds of energy and based on a 100-yard zero with the scope 1.5 inches above the bore. Your muzzle choice should also be in consideration of the flash produced and the muzzle rise with every shot. Yeah, but 9 barrel in a folder housed in a backpack is absolutely useless in .308 or 5.56. Seems a waste of powder if all it does is make a boom at the end. 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. And it is VERY quiet AND compact. The. I need to get the lathe going as well, and I havent had the time or patience to do it. 1:8 or increasingly, 1:7, especially if you want to stabilize subsonic, LONG bullets at low temperatures. If you want your pistol to have more range, velocity, and accuracy, you can opt for an 8 to 10-inch barrel. 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. SOCOM 7.62 Mini suppressor. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. 300 Blackouts effective range can stretch quite a bit depending upon your goals. The catch is on a semi auto you may wind up with weirdness around pressure curves. They had a 1.5 star rating 3 years ago. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. For the best experience on our site, be sure to turn on Javascript in your browser. For a more economical build experience, getting a full lower build kit will save you some bucks. Granted, revolvers have a barrel / cylinder gap, but that is a separate issue. It depends on the intended purpose of the rifle. My .460 XVR literally breathes fire. 300 BLK by AAC: An Introduction by Paul Erhardt. Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. John McClain, *Competitive Shooter of the Week* I was at first considering a 9" barrel with a 1:7 rifling, for that is what the cartridge was designed around. I am always available for you. Dont forget that longer barrel = greater sight distance for iron sights. When barrel friction on the bullet is greater than gas pressure behind the bullet, the bullet will slow. 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. Any 2015 announcement would probably not hit shelves until 2017 and then figure the ATF wait and you are probably going to need to wait until 2018 to get your suppressor. What happened was the Sig Brace. So would a better/different suppressor. There are a few factors to consider when selecting the ideal barrel length for a 300 BLK rifle and determining its effective range. These rounds can work well in taking out deer at distances of up to 300 meters, depending on who is handling the rifle and the shooting conditions they're in. For example, the Hornady Sub-X 190-grain load shot from a 10-inch barrel flies at 1,050 fps and drops 47.6 feet at 200 yards. The more we all know, the better organized and stronger the shooting and hunting community will be. I was thinking something along those lines, too. The main question you need to ask yourself is whether or not you plan on using a suppressor. WebThe 300 HAMR 1-11.25, 1-13, or 1-15 twist match grade barrels are optimized for accuracy with 95gr to 150gr bullets from 8 to 20 barrel lengths. Really -- the largest difference is barrel length. So, I dont know, but its all very interesting to me. With a 1-7 twist rate, for instance, it means that the bullet will be spun once over 7 inches of rifling. Its not going to be long until you want to suppress it and/or SBR it. Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. Not a bad question at all. Gun Review: Henry U.S. As an example my .243 Winchester LR308 based rifle is fine with IMR 7828 speed but Ramshot Magpro is just too violent with the rifle as configured. Also, always, always check your .223 magazines to ensure no 300 BLK rounds worked their way in when you loaded the mags. This length ensures complete gunpowder combustion to generate maximum velocity and stabilizes the bullet for a flatter trajectory and improved accuracy. A 16-inch barrel is the longest available barrel for the .300 Blackout, and it is quite effective when it comes to long-range targets. Like you stated, as long as there is more pressure pushing the bullet forward than barrel friction retarding it, the bullet will continue to accelerate. Getting away with it because they had deeper pockets (costs a lot to get SAAMI cert) and Remington Defense backing. A lighter gun via barrel would allow more other things to be used. The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. Good follow up to your other posts on 300 black. The .300 Blackout also comes in a supersonic variant, which means once fired, the bullet travels faster than the sound barrier. It gives an almost negligible muzzle rise while shooting, meaning most of the energy produced during recoil comes back to the shooter's shoulders. Despite its compact size, a .300 BLK round fired from a short barrel can still hit targets up to 100 yards away. 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. 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. Subsonic .300 Blackout rounds fix this problem by traveling slower than the speed of sound. Best Barrel Length For Suppressed 300 Blackout For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. Its an ad. I live vicariously thru you new school young guys, and your passion for AR platform and SBRs and various side uses- the hunting post you did awhile back was pretty useful, and points out the versatility of the .300. After investigation, AAC found the 7.6239 cases aggressive taper too extreme for a standard M4 magazine to accommodate. The LAST thing you want is a wobbly bullet going through your expensive muffler, not quite behaving itself. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. With a 1-7 twist rate, for instance, it means that the bullet will be spun once over 7 inches of rifling. Two Colt M16s? PWS is as close as you can get right now. 300 Blackouts effective range can stretch quite a bit depending upon your goals. Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel.

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