Hello,Matt, welcome to the forum! I would second Stumpkiller's choice of a 20 guage, but I would be using it for shooting everything from doves to bears. Back in the day a lot of trade guns were 24 guage, which is about 58 caliber. That I believe would be fine for an all around piece, and for shooting a decent sized ball at range. The biggest round ball mold Lee makes is a .60 and that is probably going to be my next smoothbore, a 20 guage. I believe you will be happy with any of the bores you mentioned, if made by one of the gentlemen you specified. A heavy breech is no problem on a tapered barrel; and it will contain the pressures you need for a ball load achieving a decent velocity/trajectory.