In keeping with this motif, an AR-15-style bolt carrier works best with subsonic. The .300 AAC Blackout is the cartridge built to function in the AR-15 platform, and with its design comes a different mindset, as the cartridge is called upon to fill a special role. 458 socom is dramatically superior at 100 … The goals of the 300 BLK movement were simple: achieve similar ballistics to the 7.62x39mm (AK) platform, develop an offering that delivers more “stopping power” when launched from a short-barrel rifle or pistol, and improve performance over 9mm offerings in the subsonic velocity band. Some of you stated that you would pick heavier and quieter rounds to preserve situational awareness and communication abilities. Summary: Subsonic 300 Blackout is significantly more powerful than subsonic 5.56, 9mm, and even .308, which makes a 300 Blackout rifle one of the most powerful nearly “Hollywood quiet” rifles you can have. 300 HAM’R. Both are short barrel rifles and when loaded with subsonic ammo, the .300 blackout is very similar is … Along with subsonic rounds, the Silencerco Saker 7.62mm is able to reduce the sound signature from your .300 Blackout rifle to a mere 132 decibels, which is hearing safe. Oh, and while you’re at it, make sure th… One last note, suppress shooting is a no brainer … 300 Blackout. As a result, 300 Blackout works perfectly with standard AR-15 magazines, bolts, and everything. The larger bullets, meanwhile, carry more kinetic energy, making for greater stopping power with each round fired. Most subsonic Blackout ammo uses a bullet in the 200-grain range, and, of course, .308 diameter. It’s where the cartridge’s roots are laid and there’s ample subsonic ammunition available. I have dies, a box of coated 245gr cast bullets from Missouri Bullets, 165-173gr jacketed bullets I bought mainly for .308 and .30-06, 170gr JSP bullets I bought for .30-30, and 110gr plated bullets I bought for .30 Carbine. To avoid it from giving a shooter’s position, subsonic .300 BLK loads use heavier bullets and adjusted powder charges—often tailored for a complete burn in a short barrel. The .300 AAC Blackout (designated as the 300 BLK by the SAAMI and 300 AAC Blackout by the C.I.P. Both the .300 BLK and the .308 Win use a .308 caliber bullet, though that’s really where the similarities end.Even if you quickly glance over the above table looking at the cartridge specs of these two cartridges, some pretty big differences should jump out at you. Meaning that subsonic 220 grain 300 blk will outperform 308 subsonic in 180 grain. I don't do either of those cartridges, so it's possible that I'm wrong about the heaviest 308s and their stabilization from a normal factory barrel. 5.56 vs 300 Blackout vs 308 Winchester: Ammunition Selection. I do realize that the 300 Blackout was designed to be subsonic from the start, even considering that the 45-70 wasn't designed to be subsonic I have read/heard of many subsonic 45-70 loadings. All you need is a new barrel. Top. The short action is intended for everything from 17 Remington up to 308 Winchester and this is the size needed for a bolt action rifle chambered in 300 Blackout. .458 socom vs .300 blackout .. ya I'm late, found out about .300 blackout and was all hot to build an upper .. then found out about .458 socom and our very own Tony Rumore's involvement in development of .458 socom. Just a quickie to see what hits on steel sound like and look like with 300 Blackout subsonic loads and supersonic loads. … That gives it an average of $1.30 per round. That makes the 300 Blackout about 45% more per round on average. Our organs are amazingly elastic and resilient. Links to published Data added. “The 300 BLK used to be an odd duck, but not anymore.” “Brass could be made from 5.56 NATO cases by cutting them down and re-necking them.” “…easy-shooting .30 caliber round…” “The 300 Blackout is a fully mature, commonly available cartridge that allows the shooter to have a vast range of options as far as end use. The casing for the .308 Win is significantly larger than the 300 BLK and can hold a considerably higher amount of powder and withstand greater pressures. The tip helps when loading a cartridge like the 300BLK because it helps the cartridge navigate the feed ramps and chamber (see OAL notes at … View topic - Powders For the 300 blk. Despite the fact that 300 BLK vs 9mm, not 300 BLK vs. 5.56 NATO, is the more appropriate comparison to make since taking down 9mm was the cartridge’s primary focus. now that Tromix is offering .458 socom barrels/parts, sure have been leaning towards .458 socom. The 9mm is also a good candidate because it generally hovers just above the supersonic barrier in terms of velocity. First, you need at least 2,500 fps to guarantee that the initial wound cavity causes permanent damage to the organs near the entry wound. In comparison, the.308 ammo costs range from $.35 per round to $1.50 per round with an average of $.90 per round. For example, costs of 300 Blackout rounds range from $.60 per round to $2.00 per round. Most factory loads of 300 Blackout have 30 bullets, which can be very light or very heavy. 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. 350 legend offers the same advantage- if you want to shoot farther you pop mags and you're good to go. A friend of mine recently showed me his custom AR-15 in .300 blackout with a 9-inch barrel and AAC 762 suppressor. Since the 5.56x45mm NATO, .300 Blackout, and .308 Winchester are so popular, most of the big ammunition manufacturers produce a variety of ammo for all three cartridges. 16.25” Barrel; Sierra 125gr SBT 2520FPS MV, 1763FP ME; Hornady 150gr SST 2290FPS MV, 1747FP ME; 7.62×39. Like previously mentioned, H110 has been extensively tested to work great for supersonics, while A1680 is great for subsonics. In a comparison of 300 Blackout vs. 9mm for use in a PDW / SMG, well, there really isn’t any comparison. Some experts say you need 3,000 fps because the bullet rapidly slows down after it leaves the muzzle and it needs to be at 2,5… Supersonic .300 Blackout does nothing that supersonic 5.56mm, 7.62x39mm, 6.8mm, or 5.45mm can’t do and subsonic .300 Blackout is a poor choice for defense. 300 Blackout is a preferred caliber for suppression in rifles, for the same reasons discussed above. The 300 Blackout Vs 5.56 conversation is like debating apples and oranges. I also realize that subsonic cartridges weren't meant for … The AR-15s 5.56mm cartridges are obviously lighter than the AR-10’s 7.62, making it easier to carry more of them. Hence, this would be a great addition for you if you have an arsenal full of other weapons besides the .300 Blackout Rifles. Heavy versions operating at subsonic speeds do not create a pronounced sound crack or disturb the sound barrier. Oh, and as an extra requirement, how about achieving the first two with the AR-15platform we already have. The Bright Line Between 300 Blackout and 5.56 NATO: Similarities between the cartridges end with them sharing the same case and being tailored for military use. The higher BC of the 300 would only matter at longer ranges that are impractical (but not impossible) for subsonic velocities when hunting.The only real advantages the 300 has is slightly quieter suppressed operation due to smaller bore diameter and the fact that is a bottleneck cartridge which offers advantages in feeding reliability. Where it differs, however, is in how many bullets you can carry at any given time. Is it possible that the venerable 308 can be quieter than 300blk?? Joker31D Silent But Deadly Posts: 304 With the right bullet and specialized loading, it can successfully be made subsonic. Thanks to its higher velocities, the 5.56 is much more adept at longer ranges. Many of the newer Hornaday projectiles have polymer tips and come in heavier weights that can be loaded for subsonic use in the 300 Blackout. Even with a suppressor, you probably won't get a heavyweight bullet to cycle "reliably" in subsonic with H110. The subsonic 300 Blackout loads are often compared to 45 ACP, 10 mm or 9mm subsonic rounds. Parting Shot. In fact, a .308 with 200-210gr bullets is hardly breaking a sweat at 2,400fps, which is faster than .300 Blackout can manage with compressed loads and lightweight bullets. Compared to the AR10 .308 rifle, both firearms are impressively light, making them easy to use. AR-15s are con… Otherwise, even though the initial wound cavity may look cool in ballistic gelatin, it is not enough to cause any real damage. AS YOU CAN SEE THE 300 HAM’R HAS A SOLID 300FPS VELOCITY AND A 400FP ENERGY ADVANTAGE OVER FACTORY 300 BLACKOUT AT THE MUZZLE. The standard .22-caliber I just built a 10.5" .300 Blackout AR pistol. Big game hunters may prefer the larger round for its ability to take down more substantial targets. 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