Originally Posted by tomkat77
the bore at the end of the barrel is 3/8 or 7/16
7/16" is about what my .450s measure at the muzzle; I thought it looked larger than a .320 or .380.
If you happen to have a .44-40, .45ACP or .45 Colt round, see if it will enter the chamber part way, or come close.
(But please don't try to fire anything