70 grains of Goex FFFG has been my standard .50 (.490) load for over 40 years. It’s a good load. Taken many a deer and hawg with an assortment of rifles, both flint and percussion with that load.
Heck I even shoot 60 of FFFG in ol’ Lazarus my .54 restocked govt. rifle. (.530 ball). An adequate charge for most all game here. And if I need, two measures full (120 grains) for them bigger critters and maybe a longer shot. Although I’m not one to pursue very long shots anymore with these 64 y o peepers. 🤣
Keep it up!!