Depends on what the gun wants, of course. In the above gun, I use a .595" ball from a
www.ballmoulds.com (formerly jefftanner) mould
along with a .020" to .022" denim or ticking patch. It shoots OK, I guess, for a smoothbore, but I am not quite happy with it. It is not nearly
as accurate as Taylor's Rice Barreled Pennsylvania Fowler, with round balls, but I'll swear it shoots better patterns with shot. Mine has a weak
choke, but shoots about modified patterns. I've never done well at 50yards on paper, however it does shoot well at 25 to 30yards.
One of the lads here shoots nothing buy a 20 bore fouler he built. He uses a .020" ticking patch and 85gr. GOEX 3F along with a .595" tanner
mould ball, same as mine.