You will probably find some excellent results with them in your KRB. I would start the loads with 70 grains of as fast a burning powder you have on hand. Goex 3f, Triple Se7en 3f, Pyrodex P, all of them would work. Triple Se7en 2f also works well but kick the grains up 10%. I've shot them with and without a wonderwad. Both ways, they shoot well.