Your gun, like most Parkers of the period, likely has oversized bores. I have measured some 12g barrels to be as high as .750". In order to determine the chokes in your barrels, or any barrel, you NEED an actual bore gauge so that you can measure the bore diameter and also the amount of constriction at the muzzle. The constriction is the amount of choke, regardless of what the bore measures.
A drop in choke gauge or calipers on just the muzzle would only be accurate if the bore was actually .729".
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B. Dudley
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