RE: Lets be honest with powder charges.
My most accurate loads:
50 cal GM LRH percussion - 80 gr Pyrodex RS, 275 gr Maxihunter
50 cal GM LRH flinter 29"- 100 gr FFFg, 275 gr Maxihunter
50 cal GM LRH flinter 21"- 100 gr FFFg, 275 gr Maxihunter
54 cal T/C - 80 gr Pyrodex RS - PRB