I recently acquired an original J Henry & son rifle. Thought it was a .32 but after extensive cleaning the barrel measures right at .303 on the lands. I guess that would make this rifle a .30 cal. Haven’t looked for a round ball mold for a .30 yet but found .283 round balls at Track of the Wolf. Was looking to shoot this rifle today but I guess that will have to wait a couple of days. Looks like I have added another caliber to my stable.