270 WSM Centerfire Ammunition

The 270 Winchester Short Magnum or 270 WSM ammo is a short, unbelted, magnum cartridge created by necking down the .300 Winchester Short Magnum and fitting it with a .277 caliber bullet. The correct name for the cartridge, as listed by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI), is 270 WSM, without a decimal point. It is a member of the Winchester Short Magnum family of cartridges.