45 Super* is the same externally as the 45 Auto, but has a thicker web, denser grain structure in the metal, and special heat treat process that enhances the durability of the case. Similar internal capacity as the 45 Auto. Some 45 Super load data was published by Triton Cartridge before they went out of business. *Loads to be shot ONLY in guns modified professionally to handle extreme pressures of this cartridge. DO NOT SHOOT IN STANDARD 45 AUTO!