I want to try shooting round balls in my .72-caliber rifle. Joe Williams made the barrel (30-inch barrel, 1:72). I believe cut rifling is .006-inch. This will be the first time I have loaded round balls in any rifle. I intend to acquire linen for patching material, between .010 and .015 inch - that is, what I can find in sufficient quantity. I use short starter for conicals in the rifle and prefer to use RBs with sufficient diameter to warrant continuing to use it.
Having a choke or taper bore .725 inch at muzzle, .731-inch remainder, what are acceptable round ball [dropped] diameters? In terms of accuracy, if it matters significantly what might be lead:tin or lead:tin:antimony mix I cast, please identify what would be preferred.