Butler mfg inc black powder hand gun need powder load size?

I would need to know the caliber and type (revolver, single shot. flintlock, percussion) to answer the question exactly, but the best place to start is with as many grains of powder as the caliber divided by half for a hand gun or revolver as a MAXIMUM LOAD. So a .45 cal. would be about 20-23 grain. I usually start out around 12-15 grains and work from there.