A drop in guage does NOT accurately indicate choke on most parkers. Especially ones made before 1920 or so.
As dean said. A proper bore gauge or at least something that you can measure the ID of the last 6" of the bore with needs to be used.
Choke is the amount of constriction in a bore, not the diameter of the muzzle.
Most parkers were over bored. I have seen original 12g guns in the .750" plus range. And guess what, they still had full chokes. That would mean a very inaccurate reading on a drop in gauge which assumes a bire diameter of .729".
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B. Dudley
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