Track of the Wolf sells a variety of round balls that will fit.
http://www.trackofthewolf.com/Categ...atID=2&subID=25&styleID=58&PageSize=25&Page=3
Smothbores are typically loaded with balls that are about .020 smaller than the bore size along with a thicker patch like .018 - .020. When the patch is wrapped around both sides of the ball it adds about .036 - .040 to it's diameter. This smaller diameter ball allows extra room for the thick patch to be compressed as the bore gets fouled with powder residue and becomes narrower.
http://www.trackofthewolf.com/Categ...atID=2&subID=25&styleID=58&PageSize=25&Page=3
Smothbores are typically loaded with balls that are about .020 smaller than the bore size along with a thicker patch like .018 - .020. When the patch is wrapped around both sides of the ball it adds about .036 - .040 to it's diameter. This smaller diameter ball allows extra room for the thick patch to be compressed as the bore gets fouled with powder residue and becomes narrower.