![]() 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. ![]() Each box contains 20 rounds of 190 grain 300BLK with Sub-X. Ok, this is what I find odd, and maybe those more knowledgeable can 'splain me this. Hornady Subsonic Sub-X offers excellent accuracy and performance in a reliable subsonic load. The last shot of this string clocked at 1060 on my magnetospeed and did not lock the action back on the empty magazine. Black ammunition was developed to ensure flawless function in suppressed and unsuppressed weapons as well as bolt, semi-automatic, pistol or carbine. The ammunition was specifically designed to feed and fit in all platforms. ![]() The max was 1061, min was 1029, SD was 14 with an ES of 32 fps. Hornady Subsonic 300 Blackout 190 Grain Sub-X 20 Rounds by HORNADY Product Overview: Hornady Black ammunition is optimized to function in a wide variety of weapon types. I still had the hornady black so I used that as a baseline for speed testing. 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. 190 Grain 1050 FPS (Subsonic) 465 FPE Uses Flex Tip Bullet Technology Expands to velocitys. Ok, so I have a newish 300 blackout build that I loaded up some subsonic loads for.
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