I do reenactment shooting and want to have the look/feel of a full powder charge without actually creating so much noise and stress in my gun. Old gunpowder was not as powerful as it is today, and 1600s powder charges were made to hold more than 200 grains. On top of that, my gun has a space between the breech face and the touch hole, so if I load less than 40 grains at the shooting range then the ball obstructs the touch hole and the gun can misfire. Given that, is there some type of low energy combustible powder that I can mix with blackpowder to make it weaker? (Hopefully without creating any horrible kind of residue/fouling)