The earliest listing I have for the 3 1/2 inch Magnum 10-gauge Super-X shell is in the April 1, 1932, Western Ammunition for Rifle, Revolver and Shotgun. It is not in July 1, 1931 or February 1932 Western paper. The Ithaca NID Magnum-10 first appears in the second 1932 Ithaca Gun Co. catalog. Remington didn't add a 10-gauge 3 1/2 inch Magnum shell to their offerings until their January 13, 1937, price lists. Peters didn't list a 3 1/2 inch Magnum 10-gauge load until their January 3, 1950, price lists.
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