A pistol-length gas system has been, for me, a key to getting fresh-off-the-workbench reliable function from subsonic Blackout. 30-caliber bullet gets put to work effectively because the pressure at the gas port is higher. Done like that, the relatively tiny amount of fast-burning propellant behind that honking. Run a pistol-length location gas port (4 inches ahead of the chamber area) with a carbine-length (16 inch) barrel. I have found that the best overall approach to subsonic function is to shorten gas system length. There’s not enough gas in subsonic, or there’s too much gas in supersonic, for both to function through a system set up more ideally for one or the other. So, despite what I’ve heard from many theorizing, you really can’t run supersonic and subsonic loads through the same gun, without modifications having been made to the gun. It works! Subsonic Architectureįirst, I’m always willing to risk boring knowledgeable readers with basic information, because it’s important to start at the start. Two Blackout barrels: carbine port location on the stainless pistol port location on the other. A 12 gauge slug, on the other hand, over-penetrates. Any bullet that’s built to either fragment or readily expand (not the same things but about the same effect) isn’t going to get far after it meets a solid object. This is really all about bullet design and bullet engineering. If anything, it’s the heavier bullets that are more likely to keep going. There’s much said, unsubstantiated, about over-penetration of higher-velocity bullets. Just a bit about the whole “defensive-rifle debate”: Some say something like, “5.56 is not a good choice for home defense.” I agree, but not for some reasons commonly given. (Clearly, supersonic Blackout beats it soundly.) 45 ACP is a reliable choice for a defensive round, subsonic Blackout beats it. 45 ACP handgun loading, if we’re going on (the admittedly incomplete) calculated energy figures. ![]() 300 Blackout subsonic loads are a little more powerful than a routine. ![]() 300 Blackout is plenty powerful, in my estimation, and with radically better shootability than a higher-pressure carbine loading. Most subsonic Blackout ammo uses a bullet in the 200-grain range, and, of course. That’s another debate for others to work though in other articles, but it’s my story and I’m sticking to it. Plus, I’m a believer in “bigger is better” respecting impact effectiveness of a bullet. Subsonic Blackout has a radically milder blast and report than 5.56 or supersonic Blackout. Now, there are some very effective flash suppressors out there, but they don’t take a bit off the noise. In the dark, maybe just up out of bed, and then there’s a blinding fireball and an ear-splitting report, and it’s difficult to recover situational awareness, especially at my age, and even with my rail-mounted light. Good stuff.Ĭivil? I don’t know how many have fired a 5.56 AR-15 carbine inside a room, but it’s sensory overload. Big bullet! My magazines currently hold my most-trusted Nosler 220-grain factory ammo. I built a specialty AR-15 for home defense that I also featured in recent book project, and that was my choice. One reason for its popularity is the supersonic/subsonic option. Pretty much, it’s for those who want a bigger bullet in an AR-15 with a minimum of technical distractions (some call them problems). I like it especially in the shorter guns, and, around here at least, it’s looked on as an effective Whitetail cartridge choice. 300 Blackout, aka: AAC, is a popular cartridge among AR-15 fans. If you go the subsonic route, please work your load up carefully practice diligently and wait patiently for the perfect opportunity.Understatement. You might get full penetration on a shoulder shot at reasonable range.that is something you will need to experiment with on test media to determine what your limits will be. When you turn the CNS switch off, there is no need for tracking a blood trail.Ī whitetail deer head will be a much smaller target. We swore an oath to each other to take only head shots, at stationary animals, at no more than 75 yds. It averages just over 1 inch 5 shot groups at 50 yds.drops about 12 inches below POA at 100 yds when sighted 1 inch above POA at 50 yds. ![]() We spent a LOT of time researching and working up this load. The moose collapsed at the shot.made no sound. He planted the bullet in the left ear exited the right side of the skull halfway between the eye and the ear. Don't know what the energy of the bullet was.head shot only. This load averages 1050 fps (chronographed) from his 18" barrel. with a suppressor to take a moose this season.
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