arcticap
Member
the gentleman on Cap and Ball used a 14.1mm ball (?). I’ve noticed he simply places the ball on the mouth and closes the breech on it.
14.1 mm is .555"
You can find .550 available at Track of the Wolf. --->>> https://www.trackofthewolf.com/List/Item.aspx/127/1/BALL-550-X
Their next larger size is .562": --->>> https://www.trackofthewolf.com/List/Item.aspx/127/1/BALL-562-X