The.358 Winchester / 9.1×51mm is a.35 caliber rifle cartridge based on a necked up.308 Winchester created by Winchester in 1955. The cartridge is also known in Europe as the 9.1×51mm.

The.358 Norma Magnum is a rifle cartridge introduced in 1959 by Norma. The cartridge is closely related to the.308 Norma Magnum and both cartridges share the same case head dimensions as the.300 H&H M