![]() It has since become one of the most popular rounds to use with a suppressor. It was designed to be used in AR-pattern rifles with only a barrel change to convert a traditional AR-15 rifle from 5.56 NATO. Now I just need to find the Hornady 190 gr SUB-X in stock somewhere.Ī place called coastal firearms shop seems to have them in stock, but seems to require a minimum purchase of $180, which seems excessive, and makes me a bit skeptical.One of the hottest new rounds to emerge in the past few years is 300 Blackout this is a true dual-purpose intermediate sized cartridge that can be fired in both subsonic and supersonic loads. ![]() That leads me to believe that I’d be able to stay subsonic when using charges approaching the max with an 8” barrel.įor the benefit of other readers, here’s the guy’s data with my assessment comparing it to Hornady predicted velocity:ģ00 AAC Blk, 9” Ballistics Advantage Barrel, 1:8 TwistĬharge Low High Ave ES Sd Hornady Data predicts:ġ2.8 1082 1125 1107 43.79 16.85 1185 fps (-78)ġ2.5 1022 1067 1054 44.55 18.05 1170 fps (-116)ġ1.9 959.8 999.4 980 39.55 14.14 1090 fps (-110) Looks like he was seeing a drop of about 100 fps from Hornady’s published data across the board when using a 9” barrel. Will A1680 or CFE BLK best meet my Triggerįunny, I just found that data in post #105 in a review of 190 SUB-X at opticsplanet. I’m going to order the Hornady projectiles tonight. I plan to use an iterative process to avoid the supersonic “crack” while keeping the charge as high a possible for gas to run the gun. And (most importantly), generate more gas to run the gun. I’m certainly getting a fair bit less than that out of 8”, so I figure if I use Hornady load data spec’d for 1100-1150 from a 16” barrel, I will likely still be subsonic out of 8”. The Hornady factory load is spec’d for 1050 fps out of a 16” barrel. I’m digging into pursuing the 3rd option. Increase gas pressure by loading a “hotter” 190 gr SUB-X load Lower buffer spring resistance with a weaker spring (already ordered from Sprinco for $30 shipped)ģ. And a titanium BCG would be cool to look at.Ģ. This is the most expensive solution, but would certainly address the issue. Lower reciprocating mass by getting a low-mass BCG (can save 3.4-3.7 oz) for $150-250. I’m a bit puzzled, as I didn’t expect to be undergassed when suppressed (although Surefire emphasizes their low back pressure).ġ. This was a pleasant surprise.Īnd 200 gr subs will function with lighter buffer/spring.īut my “primary” desired load - Hornady 190 gr SUB-X will cycle, but not consistently lock back with even a light carbine buffer and spring equivalent (I have a LAW folder installed, so reduced the buffer weight to generate the same reciprocating mass as a standard BCG and carbine buffer). I can get 220 gr subs to cycle and lock back with the same buffer/spring setup I use for supers. I finally got my suppressor for 300 BLK (SF 762-MINI2), and am testing subsonic ammo. generate enough gas to reliably run a suppressed 8” SBR (also essential) drive a 190 gr subsonic Hornady SUB-X (essential) BLUF / TLDR: do you recommend A1680 or CFE BLK (or something else?) to:
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