When your load is accurate stop.Several years ago I wanted to use the Staghornwith the 370 grain Maxi Ball. Started with 70 grains of PyrodexRS. That load made1.25 and smallergroups at 75 yards.Any more powder and the groups fell apart. Dismissed the 70 grain load as not powerful enough and went back to sabots.Have been told I'm an idiot for doing that.