.17 Winchester Super Magnum

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.17 Winchester Super Magnum, is a rimfire rifle cartridge developed by the ammunition company Winchester in 2012. It descended from the .27 caliber nail gun blank by necking down the blank case to take a .17 caliber (4.5 mm) bullet. Initial loadings were with a 20 grain bullet, delivering muzzle velocities around 3000 ft/s

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