At only 10.5 pounds and the way that Pedersoli is designed (for black powder ball) I just would not use heavier and longer conical projectiles, i.e. bullets. The recoil might kill ya.

You have plenty of power and penetration capability if you use hardened round balls in .715 caliber.

If you take the advice given here and load those round balls up to 5-7 drams you will achieve two things.

1) Achieve deadly killing capability
2) max out on the recoil you can withstand