Don,
Why don't you load black powder, the shock and awe value of BP alone makes it worth it (KABOOM). That said, I'd suggest getting 10-12 GaugeMates (machine them back 2/8's, or order them made that way) then you can shoot 12 gauge shells through your 10 gauge. I used to shoot Winchester AA Featherlites that way with a 10 gauge Colt I had and it worked great. I used the BP loads for SXS events and hunting.
Steve

Approach life like you do a yellow light - RUN IT! (Gail T.)