Used to use heavy charges of loose Pyrodex-up to 150 grains. Found out that it is not necessary. Now I use 100 grains of loose Pyrodex or two pellets.I some times shoot my rifle to check the zero or tounload it.This is done in the very low evening light. With two Pyrodex pellets there is usually no muzzle flash at all. There is a very little flash with 100 grains of loose Pyrodex.This is an indication that the charge is burning completely in the barrel.