.17 Winchester Super Magnum
American rimfire rifle cartridge
.17 Winchester Super Magnum
.17 Winchester Super Magnum, commonly known as the .17 WSM, is a rimfire rifle cartridge developed by the ammunition company Winchester in 2012. It descended from a .27 caliber nail-gun blank cartridge by necking down the blank case to take a .17 caliber (4.5mm) bullet. Initial loadings were with a 20 grains (1.3 g) bullet, delivering muzzle velocities around 3,000-foot-per-second (910 m/s).
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