In my Rem-UMC catalogues from 1910 to 1919 they offer the special length shells, though by that time the 3 1/4 inch 12-guage shells had disappeared. This from the 1915-16 Remington Arms-Union Metallic Cartridge Co. catalogue --
While the general tables for their 12-gauge shells list the 2 5/8 inch shell as the basic length, and for 20-gauge shells the 2 1/2 inch shell as the basic length, certain popular loads were only put up in the 2 3/4 inch case --
