Daryl:
The 20 bore balls in a 12 ga or a 16 ga within the shot cup? I have been experimenting with the 16 ga and using .50 balls inside shot cups to clear my full chokes. I have several double ball loads with BP substitute (777). I also have a lot of brass 2.5" 16ga cases. Everything is loose inside these, so I was wondering about lining them inside with heavy paper to bring them closer to paper shell thickness.
Suggestions?