Its rimless, straight wall case was originally formed by trimming the. 44 Auto Mag Pistol cartridge was introduced in 1971. Some of Jurras's custom Auto Mags had custom leather holsters and magazine pouches, shoulder stocks, high polish finish, engraving, and other features. They were to be custom-made to his specifications and were chambered in.
Lee Jurras of Super Vel Ammunition commissioned a limited run of Auto Mags to be given the "LEJ" prefix on their serial numbers.