Interesting on the Western Cartridge offerings. There was a Super-X 16, described as a 2 3/4" "magnum", pushing 1 1/8 oz shot. But the Super-X 16 with Lubaloy (copper-plated) shot was made up in the old, short 2 9/16" hull. That was as late as 1940. The 16 was the last gauge to transition to 2 3/4" chambers as standard, which probably explains why even some "premium" loads--the Lubaloy cost more than the 16ga "magnum", $1.48 to $1.32--were still in the old, short hulls.