[Researcher]

From the introduction in 1924/5 of the Western Super-X, 3-inch, 12-gauge load, put up in the RECORD high brass case, the load was 1 3/8 ounce --

Early 12-gauge RECORD Super-X 3-inch.jpg

Early style 12-gauge 3-in Super-X Record.jpg

One-piece 12-gauge Super-X 3-in Record Lubaloy load flap.jpg

Along with the introduction of the Model 12 Heavy Duck, the Olins introduced the 3-inch Magnum with a load of 1 5/8 ounce of shot. From the December 24, 1936 Western catalog --

Super-X December 24, 1936, cropped.jpg