Eightbore,

I guess you referring to my comment about using a 20 gauge shell. Please re-read my post. You will see that I recommend mic'ing the chambers. If he does not have access to a mic, checking the fit of a 20 gauge shell in what he believes is a 20 gauge gun does not seem out of line.

I am amazed that through all this no one else is asking about serial numbers. They could settle a lot of questions very quickly.

Pete