Scott - Simply measuring the muzzle diameter won't necessarily give you choke data, as choke is defined as the reduction in diameter at the muzzle versus the bore diameter. If you make an assumption that the nominal bore diameter of a 12 gauge is .729", then your muzzle measurement may be a reasonable guess. However, bore diameters vary widely. The terms Full, Mod, etc, are in fact defined by pellet concentrations shot on a target at specified distances
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