Use spreaders if you need to open the pattern up. Don't alter original Parker chokes.... although, Remington did cut the chokes by a different method than Parker Bros. did and from what I've read, the Remington choke tapers are not as long as Parker Bros. nor did Remington cut the chokes with an ogee taper.
I have no idea how a Remington Parker patterns as compared to how an earlier Parker Bros. patterns - all else being equal.
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