Mr. Hege:
First, you must actually know what the bore dimensions are/were. Then you must allow for shop/production variations. Then there is the possibility of factory post-production modification. And finally, you must understand that a lot of these Parkers, as well as other classic shotguns, have been honed out over the years to remove pits, etc., thus enlarging the bores.
Any or all of these factors will impact the gun's barrel condition and dimensions, i. e. "normalcy" in later years.
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