Faster ignition with 3f, I shoot 90 gr 3f and 495 lead ball with a .015 patch, This load touches holes at 50 yards off a bench rest.
Remember with BP, if you overload, say 120 gr, all you end up with is unburnt powder coming out the end of your barrel.
Shoot over an old sheet when its not windy, Start at 80 gr, check sheet for unburnt powder, if none go up 10 until you see powder,
Then go back 10 and thats your max load using the same bullet.
Good Luck, Stant