I believe Parker was ahead of the curve with respect to barrel boring. I have a 1917 12ga #3 frame 12ga that was patterned with #1 shot and 2 7/8" chambers. The bores measure .740/.742 with chokes of .037/.040. I believe the barrel men in Meridan knew large shot patterned better in a over-bored barrel. I bet Becker, Olin and Fox started with that knowledge when they developed the 3" Super-X loads.
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