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I have seen quite a few Parker 12 gauges for sale with bore diameters in the .750" range and 10 gauge Parkers with bore over .800" so you cant go by bore diameter exactly . Seems like on old American doubles they usually run a bit bigger on bore sizes and on English guns they run a bit narrow . It should be noted SAAMI specifications didnt start until 1926.
The Following User Says Thank You to Milton C Starr For Your Post: