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These were developed by John Olin at Winchester-Western and first used by Charles Askins and Nash Buckingham with a couple of AH Fox HE 3 in Super Fox guns bored by Bert Becker about 1923-25.
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It wasn't Winchester-Western, it was Western Cartridge Company! The Olins didn't buy the defunct Winchester Repeating Arms Company until the end of 1931. Askins and Sweeley were at the A.H. Fox factory working with Becker the summer of 1921. Buckingham's testing of an early Super-Fox and early Western progressive burning powder shells, written up in his article "Magnum Opus" in the September 1955,
Outdoor Life, likely took place in the fall of 1921. The 2 3/4-inch 12- and 20-gauge Super-X shells were on the market for the 1922 season with the 16-gauge Super-X 1 1/8-ounce load added late that year. This magazine ad appeared in the October 1922, issue of
National Sportsman and other sporting magazines.
Ad introduces 16-ga Super-X load in Field Shell Oct. 1922.jpg
The term "Magnum" wasn't applied to the 12-gauge, 3-inch, Super-X 1 3/8-ounce load. The term "Magnum" was used to describe the 12-gauge, 3-inch, 1 5/8-ounce load which came out in 1935, along with the Winchester Model 12 Heavy Duck.
Super-X 12-gauge, 3-inch, 1 3-8 ounce #4Ls top.jpg
RECORD Super-X 12-gauge 3-inch MAGNUM #5 chilled.jpg