The .358 Norma Magnum (.358 NM or 9.1x64mmBR) is a bolt action rifle cartridge introduced in 1959 by Swedish company, Norma. It is closely related to the smaller-bullet .308 Norma Magnum. Both calibers share the same dimensions of the case head as the .300 H&H Magnum, but have far less body taper, resulting in the same internal capacity in a shorter case. The cartridge case is the longest that will comfortably fit in a standard Mauser action, or any rifle action designed to chamber the 30/06. The .358 NM was the first .35 caliber cartridge commercially developed and sold to the American market since the decline of the .35 Newton in the late 1920s.