The 10mm Auto, developed by Jeff Cooper, features a longer case (0.992") and uses a large pistol primer, offering higher velocity (1300 fps with 180gr) and more recoil. The .40 S&W, from Smith & Wesson, has a shorter case (0.850"), uses a small pistol primer, and achieves lower velocity (1130 fps with 165gr). Both are suitable for defense and law enforcement, with 10mm also favored for hunting.
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