Pyrodex RS. Uses normal brass measure for BP. 50 grains is fine no more needed at 50 yds. Maybe 60 at 100yds if you have an old door as Target!! Just split a No3. 12g cart if you want to use as a shotgun, Powder soft wad. Shot then card over shot or another soft wad.

I used. 6 x. .36 Cal balls in mine just to try. That's the min you can put in a shotgun for size and amount of ball. if using on a permission. Watch your backstop though !!!!