I use about 85 grs of pyrodex p, and in a hurry and don't swab between shots, I push 5 shots, 2 pellets, 2 maybe 3 shots then swab. but I got in the swabbing between every shots.

and for the powerbelts, next year I will work a load for those, out of time this year to do that, less then 2 weeks togo