Is it a 50 or 45 caliber? As far as commerical bullets you may want to try 465gr NoExcuses. Regarding powder, a lot of us White shooters use 777-2f,3f or Swiss 3-F. Doc White favorite is Pryodex P. As far as loads, anywhere from 60-90gr seem to work best. With Swiss 3F I would use 65 or 70gr.