Miller, thanks. That is what I have heard also, that the early 4 bores were 1.052 as a true 4 bore and later ones from what I have gathered, were from .935-.960.

Hopefully the plug gages I made will help in determining what the bores are on these different 4 bore guns.

My friend also has a few of the 4 bore rifle bullets. The cases are 4 1/2" long and the solid lead bullet I think is 1750 grs., which equates to a 4 oz. piece of lead.

David