Thread: Trailboss, 151gr cast hollow points and 300blk

For the 300 blackout, if you want 1050 fps:

6.3/950 = X/1050 solve for X
X= 6.9 gr of Trailboss for ~1050 fps

For my 308 subsonic for 175gr/178gr bullets: at ~1050 fps it is 10.8gr of Trailboss

10.8/175 = X/150 solve for X, the load using 150 grain bullets
X= 9.3 gr of Trailboss for 150gr bullet at ~1050 fps

The above calculation method will get you very close to your desired load, with slight variation in loads needed to account for barrel friction differences and barrel lengths (maybe off by 0.1-0.2 gr at most). Try it and let us know. I can't help you with Trailboss subsonic loads for 5.56/.223.


Does this make any sense to anyone else? seems like there is a way to calculate before pulling the trigger

I copied it from a Usa forum