The 8x56mm Mannlicher–Schönauer, also known as the 8x56mm M-S, is a rifle cartridge developed in 1908 by Steyr Mannlicher for use in the Mannlicher–Schönauer bolt-action rifle. It features a rimless, bottleneck case design and typically uses an 8mm bullet with a diameter of .323 inches (8.2mm). The standard bullet weight is around 196 grains, though other weights are also available.
The 8x56mm Mannlicher–Schönauer was primarily employed as a hunting round, particularly effective for medium to large game such as deer and boar due to its good ballistic performance and accuracy. The cartridge saw popularity in Europe, especially in Austria and Greece, where it was also used in military service during the early part of the 20th century.
While it has been largely replaced by more modern calibers, the 8x56mm Mannlicher–Schönauer still enjoys a following among vintage rifle enthusiasts and hunters who appreciate its historical significance and effective performance.