Austin,
That plot is very strange. I would like to read the article where it was published. By the very definition of shotgun gauge it truly makes no sense. Did it say where the bore diameter was measured? It was well known long before Parker started making shotguns that a gun with a bore diameter of 0.740" to .751" is a tight 11-bore and .751" and above is a wide 11-gauge and should be proof tested accordingly. It seems to me that such over boring of the barrels would result in loss of pressure, permit escape of gasses around the wad, and reduce the shooting quality of the gun. Parker always prided themselves on making a hard shooting gun. I had always thought they abandoned production of eleven gauge guns by the mid-1870's. Why would they make 11-bore barrels for "12-gauge" guns? That is really wierd. Please give me the info about the Parker Pages article---maybe it gives some clues.
Thanks,
Richard
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