Thread: 300BLK questions

Hi Ash. The 300BLK case is a lot smaller than the 308 case. You won't be able to get 7.5gr of trail boss in there without compressing it (which is big no no with that powder).

From memory, 6.2gr was a full case for me using a 125 Speer TNT and that was doing about 850fps. Lead projectiles have less friction and get moving easier, offsetting some of the weight, so I'd estimate about 800fps for 151's with a similar charge.

For that reason, I much prefer using AP70 or AP100. They're more dense than trail boss and you can fit enough in to get 150 to 220gr bullets up to 1050fps. They're still very fast burning which means they suppress nearly as well too.