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You would need a bore gage .....to measure the inside of the barrel accurately .....and then the choke ( so you can get an accurate reading on the constriction amount )....
Barrels ....from some mfg's ...and on some models / especially with this "back boring" barrels that has been common at least among Browning and Beretta for the last 10 yrs or so, especially on their "target" guns...will vary a little bit over traditional dimensions on a 12ga or 20ga barrel...
but you'll have to check it to see......some gun clubs, have a bore gague that they let members use.../ or maybe one of your buddies bought one...( you can't do it accurately with a caliper...)
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