This is a 12-gauge gun chambered for the 12B brass Parker shells. A12B brass shell ialmist the same size as a modern 14-gauge shell. There will be Parker 12B shells at the SXS and they should fit perfectly. The .731 bore dimension is nearly perfect for a 12-bore size (0.729") indicating only slight pitting. I hope you bring it to SXS---I would like to see it.
Yours,
Richard B. Hoover
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