Along about 1935 with their introduction of the heavy 3-inch chambered 12-gauge Model 12, the Olins brought out the 3-inch Super-X and Super-Speed 12-gauge "magnum" shell loaded with 1 5/8 ounces of shot. Prior to that the the 12-gauge 3-inch Super-X carried 1 3/8 ounces of shot from its introduction along about 1922.