Recently, the company added the Controlled Fracturing Subsonic line with two projectile options weighing 168 and 198 grains. Its Maximum Expansion projectile is an all-copper bullet that expands massively at subsonic velocities and typically retains 100 percent of its original weight. Lehigh Defense spearheaded much of the early progress made on bullets designed to be effective at subsonic velocities in tactical situations. ![]() ![]() However, I have found a noticeable divergence in the point of impact (POI) among different brands of subsonic ammo, so always confirm the POI differences between your training and tactical rounds. This lets me keep my expensive AR500 steel targets on the rifle range but still get the fun of ringing steel in training with my AR. I enjoy shooting these tremendously, since I can shoot my AR in my pistol bay, where I have multiple inexpensive mild-steel targets. Most are loaded with heavy match or ball projectiles that are neither designed nor intended to expand in tissue in a hunting or tactical scenario. Many of the available factory subsonic loads are intended solely for range use. The short version of all this is that times are good for those of us who like to shoot subsonic 300 Blackout ammo. Additional varieties are available from numerous less well-known manufacturers like Engel Ballistic Research and Atomic Ammo. High-end maker Lehigh Defense offers what are arguably the most high-performance subsonic tactical loads for the 300 Blackout. Imported subsonics are available from Magtech, Armscor, Geco and Sellier & Bellot. Remington and Winchester also have subsonic loads in their affordable UMC and White Box lines, respectively. Ammo giant Federal offers an affordable subsonic option in its American Eagle line. Hornady produces factory subsonics like the hugely popular 208-grain A-MAX load in its Black line, and expanding subsonics like the 190-grain Sub-X. With the ability to shoot suppressed 300 Blackout rounds, the market has demanded more options from ammo makers. In fact, the timing of the standardization of the 300 Blackout and the huge boom we’ve seen in suppressor sales in the last decade are definitely related. In fact, getting some factory subs for comparison might not be a bad test in any case.Ĭan't really think of much else to post at the moment, other than "good luck!"Train Harder With 125-Grain SIG Elite Performance 300 BLK Loading 300 Blackout Ammo if it doesn't easily go all the way in you might need to compare with some factory ammo to see if maybe you have a sizing issue. ![]() There's a pretty good discussion of port sizes here: ĭoes the bolt lock back on an empty magazine shooting the subs? Have you tried the "plunk test" - BCG removed, muzzle pointed down, manually dropping a round into the chamber should go "plunk". Oh - and might as well check the gas port size while it's open, too. If not right, adjust as appropriate when you put it back. Unless it's a pinned gas block you should be able to check alignment by loosening it and sliding it forward to check the soot mark around the barrel port (most gas blocks are drilled enough larger than barrel ports that the leave an easily seen ring). Have you tried generously lubricating the buffer spring? I once had a problem similar to that you describe and a bit of white lithium grease rubbed up and down the buffer spring solved it. It's usually the shorties - under 10" - that need the can to cycle with subs. With a 16" barrel and mid length gas system it 'should' be able to cycle using subsonic ammo even without a can.
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