Bore Diameters
Jack : first thanks; your article is on its way to the Autumn Parker Pages.
Second; if the muzzle ID is .720 and the wall thickness is .050 at the muzzle, you probably have a regular set of Parker barrels in the serial range 5000 - 70000 with .750 bore diameter and .032 choke. If that bore diameter is 4 inches or more behind the muzzle, it may be a 14 ga gun.
Best, Austin
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