Kurt, Austin and I have both commented in the past about Parker competition guns that have bores larger than the nominal .729. The Parker order books are full of requests to make patterns tighter, clean up bores, you name it. Your gun could have been returned to PB to tighten the pattern. The easiest way for them to tighten the pattern is to enlarge the bore without enlarging the choke area. However, there seems to be some evidence that some singles were originally manufactured with large bores.
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Threaded Mode