Wbw, since powder is hit or miss just think standard load shotgun powder and there is a lot of that will work. Some might be better than others but the main thing is to keep the guns a running. Herco,wsl, unique,AA 2,5 and7, red dot ,bullseye,700x,231 for instance are all good for what you're doing but there are lots of others. Dusty boddams