The .44 Remington Magnum, or simply .44 Magnum (10.9×33mmR), and frequently .44 Mag, is a large-bore cartridge originally designed for revolvers. After its introduction, it was quickly adopted for carbines and rifles. Despite the ".44" designation, guns chambered for the .44 Magnum round, and its parent, the .44 Special, use 0.429 in (10.9 mm) diameter bullets.
The .44 Magnum is based on a lengthened .44 Special case, loaded to higher pressures for greater velocity (and thus, energy). The .44 Magnum has since been eclipsed in power by the .454 Casull, and most recently by the .460 S&W Magnum and .500 S&W Magnum, among others; nevertheless, it has remained one of the most popular commercial large-bore magnum cartridges. When loaded to its maximum and with heavy, deeply penetrating bullets, the .44 Magnum cartridge is suitable for short-range hunting of all North American game—though at the cost of heavy recoil and muzzle flash when fired in handguns, less so in carbines and rifles.