The scrap of paper I used is lost to time, though the entry where I was going to enter the charges in my book remains. In case you are wondering why I have not listed powder weights for the velocities in my excitement to make up the loads, I did not record the charges in my reloading book. Anyway, I'd love to hear your musings on this. The 220 gr BTHPs locked the action on an empty mag with measured velocities of 772, 797, 866, 933, and 976 fps.ĭon't get me wrong, I'm glad that the firearm is cycling with the anemic loads, but it seems odd to me that the factory subs consistently cause malfunctions at higher velocity (and I would assume pressure) than the hand loaded ammunition. The 208 gr BTPHs locked the action back on an empty mag with measured velocities of 801, 872, 971, 1006, and 1065 fps. Ok, this is what I find odd, and maybe those more knowledgeable can 'splain me this. The last shot of this string clocked at 1060 on my magnetospeed and did not lock the action back on the empty magazine. The max was 1061, min was 1029, SD was 14 with an ES of 32 fps. most subsonic loads are running 30-35,000). I still had the hornady black so I used that as a baseline for speed testing. It should be noted that these long bullets are most accurate when fired from. Hornady black and the remington 220gr OTM subsonic both failed to lock on an empty mag.įast forward a few weeks and I have a 5x5 load test for hornady 208 and 220 gr BTHPs using Accurate 1680 powder. Everything but the Hornady black 208gr Amax subsonic cycled fine (2 of 5 short-stroked and did not pick up the next round). But before that, I took several factory offerings (subs and supers) and ran them through the gun just for function check. Or just the typical subsonic specialty bullets at subsonic speed some of those may be interesting pushed faster but you'll likely find them shedding noses and/or petals, which isn't completely a bad thing but you need to be aware of what they do.Ok, so I have a newish 300 blackout build that I loaded up some subsonic loads for. Anyway, my buddy uses accurate 1680 and I’ve shot some of his loads and works great. You would think a powder that’s designed around the 300 black out would meter better. Is there a go to powder for subsonic 300 black out CFE Black is a joke and a terrible powder. Known for its ability to deliver heavy subsonic bullets for standard AR magazines while cycling the. The Snipers Hide App is here Download the app DOWNLOAD. The 300 AAC Blackout (300 BLK) is a popular alternative cartridge in the AR-15/M16 M4 (AR) community. ![]() JBill Marr 300 BLK, Cartridge Selection, Reloading 0. It's a better killer with the 110-125gr class and plenty of proven good bullets (like the black tip mentioned above, or the 125 NBT, both of which expand well at reasonable ranges and penetrate deeply). 300 BLK load development: 125, 135, 175 and 220 SMK with H110 and IMR 4227. I really don't see the point in pushing heavy bullets to medium-slow speeds in the Blk though. But the ELDM (and other SST bullets I've used) seem to have a lower limit around 1800-1900 in my experience. There aren't many 30 cal rifle bullets that expand significantly below 1600 fps the Barnes110gr black tip does for sure, and of course the various specialty subsonic bullets, and Nosler's ABLR line does as well although it's kind of toeing the line right there. Talking about expansion in live meat, and not just what they do when hitting bone, or inappropriate test media. I'd be really surprised if the SST did either. In my experience, an ELDM doesn't have a particularly soft tip and doesn't expand at those speeds from the Blackout. Click to expand.Based on testing in what media? Since you said "should be an effective killer" I'm guessing you haven't killed anything with them yet, so no meat results? If you're testing in sand or something like that, you're probably seeing results that don't line up with what happens in meat.
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