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, all guns chambered for the .44 Magnum round, and its parent, the .44 Special, use bullets of approximately 0.429 in (10.9 mm) diameter. The .44 Magnum is based on a lengthened .44 Special case, loaded to higher pressures for greater velocity (and thus, energy).