Quite normal for Parkers of the Remington era. Remington had different choke boring formulas and essentially tossed out the "tried and true" methods Parker Bros. had developed over a forty or fifty year span. Parker Bros choked their barrels to print a desired number of pellet strikes within a prescribed circle at a specific distance while I believe Remington choked their barrels to put a percentage of the shot charge in a circle at a particular distance and for a certain gauge to throw a MOD pattern the choke was cut at .0XX" constriction with just a simple taper. For each gauge and each choke, Skeet In, Skeet Out, IC, MOD, IMOD, Full there was a specific constriction the barrel borer was to adhere to.
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Threaded Mode