Parker guns were bored "to deliver"; because of this there is no dimension that will verify that an individual gun is full choke, or any other choke except cylinder. Parkers made in Meriden were bored with a "nut borer" that was used to ream material from the choke until the desired pattern was obtained. This produced an "ogee" choke taper( ie two merged radii). Most of the time, the final boring produced a choke taper that was minimum diameter a few thousandths of an inch behind the muzzle.
Measuring and plotting this ogee curve in a few guns will soon show this pattern. Determining if an individual barrel has had a dent removed, or filed to square the muzzles requires both experience and luck, in all but extreme cases.
Best, Austin
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