I have an Ithica Lewis with Damascus barrels made in '05 (last century that is) and a S.S. Northcott with English proofs on a twist barrel about 1890's vintage. Both are 12 ga. I have shot skeet with them for years with PB smokeless loaded in the sub 6k range with 1 oz. of shot.

I have also shot a lot of black powder, both 2f and 3f with equal volumes of shot and powder.

The smokeless is a whole lot easier but I just can not give up the smoke and stink of bp.

Good luck
RPr