I've been on the quest to get my Pedersoli Sharps to shoot pp as well as it does cast. I wanted to get up around 1,500 fps and stay below 29,000 psi with 1" or better groups using a Lyman 500 gr. round nose, cast out of 50/50 ww/range lead and tin. The bullet was sized to .4520", patched up with tracing paper, then sized to .4580" and lubed with my home made lube. The bullets were weight sorted and the brass was partially sized, annealed and taper crimped after loading. This 5 shot group measured at exactly 1" center to center.