The 10mm Auto round, often referred to as the “.40 super,” was created by United States Marine Lieutenant Colonel Jeff Cooper. Cooper, who died in 2006, was considered by many to be one of the best handgun handlers in the world. His thought in designing the 10mm was to provide a happy medium between the power of the .45 and the usability of the 9mm. He first created the 10mm in 1983 with the Bren Ten pistol. It was later implemented, though just for a few years, by the FBI following the famed 1986 FBI Miami shootout.
The round has had a tumultuous history, with Bren Ten going bankrupt in 1986 because their pistols never gained popularity due to their cost. However, in 1987, Colt begin producing their Delta Elite pistol, which was meant to be a m1911 style pistol, only chambered in 10mm auto. Then, in 1989, is when the FBI began using this caliber.
However, after only two years in use, the FBI changed to the .40 s&w for many reasons, two of which being the massive amount of recoil in the 10mm auto and the size of the gun needed to shoot the round. In fact, many FBI agents simply couldn’t carry a gun chambered in 10mm auto because their hands were too small. Though its use is rare, there are still many who like to shoot the 10mm auto recreationally.
Each box contains 100 once fired brass shell casings. Headstamps are mixed. This is unprocessed brass sourced from commercial shooting ranges. The casings have been washed and polished, but not resized and may still contains the spent primer.
It is recommended that all brass be inspected prior to being reloaded and fired.