I don't know - I only took one powder with me today. Hard to believe that another powder, at similar or higher velocities, would shoot a golf ball size group. Do you think powder could make that much difference? I have used other bullets of the same weight, with the same sabots and powder charge; and gotten real good results. At this point, I'm thinking it is the bevel that the mold put on the base of the bullet. Other bullets that have shot well with this recipie all had a fairly square base.