The 9.3×64mm Brenneke (also unofficially known as the 9.3 x 64) is a rimless bottlenecked centerfire cartridge developed for big-game hunting. The 9.3 denotes the 9.3 mm bullet diameter and the 64 denotes the 64 mm case length. Using the bullet diameter is unusual in German cartridge designations. Normally the approximate land diameter of the barrel is used for such designations.
The 9.3×64mm Brenneke can be chambered in standard-sized Mauser 98 bolt-action rifles. The M 98 bolt actions and magazine boxes of standard military Mauser 98 rifles, however, have to be adapted by a competent gunsmith to function properly with these magnum cartridges since their cases are longer and have a larger diameter than the 8×57mm IS service cartridges.