Congrats on the new toy! I have a Stan Baker all-gauge set and love it. As far as "nominal" goes, it is just that. I don't think a couple thousandths either side will make any difference and would be in tolerance levels.
In my experience measuring the choke area, I do try to get right to the edge of the muzzle, but make note of where the most constriction exists. I have seen some chokes (not Parker) that had a "huge" difference in the last <1" and some that have a long parallel segment, then a gradual taper and a few that actually close then open up at the end. So, I guess you can find any type choking but as far as Parker chokes, I can't say one way or the other what a 'standard' Parker choke looks like.
It is fun to see how consistent those "good barrels" are.
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