.17 Hornady Magnum Rimfire, commonly known as the .17 HMR, is a rimfire rifle cartridge descended from the .22 magnum. It was developed by necking down the .22 Magnum case to take a .17 cailber (4.5 mm) bullet. Commonly loaded with a 17 grain (1.1 g) bullet, it can deliver muzzle velocities in excess of 2550 ft/s (775 m/s).
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