What is the MAX charge in a Green mountain 7/8" X 42" in .50 cal (RB)? How about the best hunting loads and target loads/patch combinations you all have come up with using FFF or FF using this barrel on your rifle. My rifle will be a flint by the way. It's being built now and I would like to get some ideas. I am used to the Lyman GP rifle in .54 (percussion) had it for 13 years. It's Max charge according to LYMAN is 100 grains of FF, and 80 Grains of FFF. I would appreciate your inputs/insight on this! My GP's most accurate is a .530 with 80 grains of FF using a TC .018 pillow ticking. How about the 7/8" GM in .50?