The 270 Winchester Short Magnum or 270 WSM is a short, beltless, magnum cartridge created by necking down the .300 Winchester Short Magnum and loading it with a .277 calibre bullet. It is a member of the Winchester Short Magnum family of cartridges.
The 270 WSM cartridge is an improvement over the older 270 Winchester providing higher velocity with bullets of the same weight, and thus a flatter trajectory and more energy. Velocities tend to be about 250 ft/s (76 m/s) faster, in a cartridge that is shorter and can therefore be used in a shorter rifle action resulting in a more compact rifle if desired.
The .270 WSM is the only cartridge of the WSM family that produces notable ballistic gains over other existing cartridges.
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