I appreciate everyone's comments on the rifle. it is so unique - it's a marvelous design! Let me say, perhaps the Cadillac of the percussion half stocked rifle.
I know what my own rifle of same bore likes, and I'll be trying loads around that....613" pure lead ball, .023" cotton patch with mink oil, Lehigh Valley, and Mr. Flintlock, and between 80 and 140 grains FFg GOEX Cartridge black powder. Mine likes 127 gr. 2Fg. It'll be a pleasant day at the range. But have to wait for Monday or Tuesday next week...our annual rendezvous is this weekend, and I'm the Booshway.