![]() ![]() The 300 gr TTSX Buffalo Bore load has a whopping 2,405 ft-lbs of kinetic energy at the muzzle compared to 1,242 ft-lbs for the GameKing bullet. To be subsonic, muzzle velocity limit is just over 1000 feet per second (fps). Although the 458 SOCOM might not be the fastest round at the muzzle, it is packing a ridiculous amount of kinetic energy. 300 win mag 300 blk 300 blk subsonic caliber 223 rem 22-250 rem 243 win 300 blk subsonic (9' caliber 223 rem 300 blk 243 win 6mm creedmoor 6.5 creedmoor 308 win 260 rem 270 win 30-06 sprg 300 win mag caliber 243 win 6 mm creedmoor 6. 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. For reference, the speed of sound in fps is 1,125. 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. Performance of 300 Blackout Subsonic meets or exceeds FBI Protocol terminal ballistic test requirements. The 208 gr BTPHs locked the action back on an empty mag with measured velocities of 801, 872, 971, 1006, and 1065 fps. Hornady® Subsonic Ammunition designed for accuracy and performance below the speed of sound now comes in both rifle and handgun loads. 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. 44 Mag gets the win with the parameters OP set up. As stated above, the advantage of 300BLK is getting 30 rounds into a mil spec AR15 magazine, using an AR bolt, a 9 inch barrel, and firing. I still had the hornady black so I used that as a baseline for speed testing. FMJ, or Soft point will be almost useless in either caliber at subsonic velocities. 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. Ok, so I have a newish 300 blackout build that I loaded up some subsonic loads for. 9mm Ammo 300 Blackout Ammo Shotgun Ammo Rimfire Ammo Reloading Also in Ammo: Rifle Ammo Ammo Cans Subsonic Ammo Handgun Ammo Steel Cased Ammo Storage XM855. ![]()
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