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Many gun clubs have a "bore gague" ....that they will let you use at a table in the clubhouse - to check the diameter of the bore against the diameter of the various chokes --- and calculate that difference ...which is what you want to know. Most of us don't own bore gagues...
Ideally you should check every screw in choke you have - regardless of what they're marked / they could differ more than you would think.
Most every 12ga barrel will be a little different --- even within the same mfg's ...
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