You can't "reduce" the powder fouling, what you have to do is wipe the bore between shots. With 777, I found that a slightly moist patch followed by a dry one would remove enough of the "burn-on" in the breech area to permit seating of the next bullet. In my guns, 777 fouling is worse than with any other powder except GOEX black. In fact, the Swiss BP fouls less than 777! Pyrodex, Clean Shot (American Pioneer) and GOEX Clearshot are all better than 777 as far as fouling is conerned.