Don't assume anything when it comes to bore dimensions! EVER!
Measure the bore yourself, and than buy wads or punches to make wads according to what YOU need in that gun. These guns can run from .73 to .76 caliber. And, I am willing to bet that someone out there has a "Bess " that is either smaller or larger in bore diameter than I have said here.
Measure your bore. When you order a punch, ask the person what the exact dimension of the punch is. You may have to order the next size larger. :hmm: :thumbsup: