I misspoke on my earlier post. There was only a year wait for the 12-gauge 3-inch Super-X load to become available. The 2 3/4 inch 1 1/4 ounce 12-gauge load and the 1 ounce 20-gauge loads came out first in 1922, with the 2 9/16 inch 16-gauge load coming out just a bit later. The 3-inch 12-gauge Super-X load was available in 1923 --
The 2 1/2 inch .410-bore Super-X load appeared in the 1924/5 price lists. I don't have any Western Cartridge Co. paper from 1926, but by the January 1, 1927, price list the 2 7/8 inch 10-gauge Super-X load of 1 5/8 ounce of shot is included.
