The 10mm auto was designed as a middle ground between the 9mm and the .45 ACP. It was designed to be a medium-velocity pistol cartridge with better external ballistics (i.e., flatter trajectory, greater range) than the .45 ACP and capable of greater stopping power than the 9mm. Although it never gathered sufficient support through military and law enforcement application, special teams still use the 10mm. At full potential, the 10mm Auto produces energy slightly higher than an average .357 Magnum load and below standard .41 Magnum rounds. The cartridge is considered to be high-velocity, giving it a less-curved flight path upon firing (also termed "flat-shooting") relative to other handgun cartridges. In its lighter loads, the 10mm Auto is an exact duplicate of the .40 S&W cartridge. More powerful loads can equal or exceed the performance of the .357 Magnum, and retain more kinetic energy at 100 yards than the .45 ACP has at the muzzle. Not only does it have popularity as an anti-personnel round, but the 10mm is legal in many states to use as a hunting round.
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