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10mm Ammo Specifications

The 10 millimeter caliber ammo comes in two standard calibers: 10mm Auto and 10mm Magnum. They are each rimless, straight cartridges necked to 10.74 mm. They have respective variations in case lengths (25.15 mm vs. 31.88 mm, respectively), rims (10.77 vs. 10.8), bases (10.74 vs. 10.8) and overall length (32 vs. 39.48).

10mm Ammo History

The original 10 mm ammo was designed in 1983 by firearms expert John Dean Cooper, a member of the FBI. He sought to find a happy medium between .45 ACP ammo and 9x19 Parabellum cartridges, looking for ammo that could travel farther while providing heavy stopping power. Before the FBI adopted 10mm ammo in 1989, the Bren Ten pistol, made famous by Don Johnson's character in the hit TV series "Miami Vice," was the only firearm that fit the rounds. After extended testing, the FBI decided 10mm ammo had too much recoil and was only compatible with pistols larger than the FBI preferred to make standard issue. Ultimately, it was replaced the .40 S&W cartridge, which delivers the same performance of 10mm ammo, but can be retrofitted into more prevalent 9mm automatic handguns. There is still a loyal fan base for 10mm ammo among civilians and some law enforcement agencies. Because of its power and trajectory, it is a popular choice among gun enthusiasts looking for a hunting sidearm or trusty self-defense option.

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