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Since smoothbores lack the grooves for the patch to compress in a smaller ball dia. and thinner patch - compared to a rifle - are usually recommended. For my use, mostly, a rifle ball .010" under bore diameter and a patch around .018" to .024" works for my rifle-guns. A smoothbore often likes a ball .015" to .020" under bore dia. and a thinner patch; the .012" patch suggested by Grenadier sounds like a good start.