Savage started that 2 3/4 inch chambering business right at the same time that those Remington era Parker spec sheets were still calling for the 1/8 inch shorter chamber than the intended shell?!? I kind of suspect that the "Chambered for 2 3/4 inch shells" line in the late Savage era Fox catalogues really had more to do with bringing the 16- and 20-gauge guns up from the old "standard" of 2 9/16 and 2 1/2 inch shells.
Of note, while all four of our big ammo brand names put up their progressive burning powder, high velocity, one ounce 20-gauge load in a 2 3/4 inch shell - Western Cartridge Co.'s Super-X, Remington's Nitro Express, Peters High-Velocity and Winchester's Super-Speed - Winchester also offered that same one ounce high velocity 20-gauge Super-Speed load in a 2 1/2 inch case from at least the early 1930s to WW-II.
