need some cast load data for 300 blackout I have some 155grn boolits ready to load once i find some data
have IMR 4227 and some TRAIL BOSS and some imr 4198 on hand

thabnk you
casca

What firearm to be fired in? Which mold?

On the safe side, start at low jacketed data on that range and work up. I've used unique, h110, lil gun and a1680, no data personally with those powders.