Quote:
I have a #6 frame PH that letters as a factory 3 1/2" gun
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Sure that wasn't 3 1/4 inch? That is the longest 10-gauge cases I find being offered in the old ammunition catalogs. By 1910, UMC was no longer offering 10-gauge NPEs for smokeless powder longer than 2 7/8 inch and by the Rem-UMC 1918-19 catalog no 10-gauge NPEs were being offered longer than 2 7/8 inch.