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Jay I know this is not as precise as some would like , but close enough for me. Using inside calipers with tape on the points measure the bore diameter past the choke (5 or 6 in.)then the diameter at the muzzle and it should give a rough idea of constriction. It is done by feel with the inside calipers as in using a feeler gauge then calipers measured with the a caliper that you use at the muzzle. I know what I mean but can't seem to explain it.
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