Mike;
There are a number of bore gauges out there- Galazan sells one as do a number of other manufacturers. You need to find the ID of the bore at least 6-8" back then the ID of the choke for the last 2" at least then subtract for the constriction. Those brass plug gauges that you stick in the muzzles are close but don't really give a true reading of constriction.
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Wag more- Bark less.
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