Parker bore diameters for 12 ga. guns up until about S/N 60,000 are over-bored. I'll let Dean display the chart from Austin. My 1882 12ga. hammer gun measures .756. I have yet to measure a Parker 12 ga. that reads the nominal for a 12 ga. at .729. They are all .732 or a few thousands higher. Don't know about other gauges. I have the Stan Baker micrometer set.
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