Mark,
My reply was not to in any way condone the altering of a Parker choke as that is something I personally would never do. Like you I also have what I believe to be unaltered chokes that have no parallel section. I think there was a typical boring that was done for the intended pattern but when the gun when for patterning testing they would then be adjusted as needed to meet the customers requirements. I obviously have no proof of this but that is how I have interpreted what I've read on this subject over the years.
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