Bryan,
Great to hear from you. Bring her out to Old Forge. Let me or Carl know you are coming out and one of us will measure your wall thickness. A second opinion is worth it for this.
The early 12s had some larger bore diameters than the standard .729
Given the chokes it is likely she was opened up. But as long as the wall thickness is good you will be golden. You will like the 2 1/2" shells. Less recoil.
Sounds like a cool gun.
John
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