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That is a great gun. It appears that Your micrometer is reading 0.752 left and 0.731 right. Does your mic have an extension or. Is it reading right at the muzzle? In this case it suggests it may be cylinder bore on left and choked 0.021 on right? Can you get measurements of the. Barrels 9 to 15" from breech? And what about the chambers. Can you get measurements? If you have no suitable bore gauge, can you tell us What is the fit of a modern 12-ga and a modern 10-ga shell?
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