Austin, I don't have the drawings and specs in front of me, but we have found several instances of Parker Brothers memos and drawings that specify chambers 1/8" shorter than the shells meant to be fired in those chambers. We have also seen Parker Brothers hang tags specifying "2 5/8 inch chambers for use with 2 3/4 inch shells." We have also seen Parker Brothers orders specifying the same thing. I believe I have articles from older American Rifleman magazines noting that this short chambering is somewhat of an industry standard, although not universal. These Parker Brothers standards continued into the Remington era. I think it would be very easy to confirm by examining stock book entries from the twenties that indicate that a gun has been built with 2 5/8" chambers and proved and patterned with 1 1/4 ounce shot loads.
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