Richard,
I have sent in the money for the Parker letter. I called the gunsmith who did the barrels and he said the original bore was .752/753 and he opened it up to .765. The thinnest spot after the job was complete was.33. He does not remember what the chamber size was. I asked him again about the gauge and he said it's tough to say because a lot of the old Parkers were just plain big.
I have not heard from you about an email to send you pictures. Is it because you were under the impression that the gun was for sale? If so, I am sorry I mislead you. I will continue to share with you what I find out.
Carl
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