Powerful semi-automatic pistol magnum delivering .44 Magnum-class energy from a gas-operated pistol platform. Designed for the Wildey semi-automatic pistol and later chambered in the LAR Grizzly Win Mag.
Type: Pistol
Introduced: 1979, United States
Parent case: .45 ACP
Standardization: SAAMI
Bullet diameter: 0.451" (11.45 mm)
Case length: 1.198" (30.43 mm)
Overall length: 1.575" (40.01 mm)
Max pressure: 40,000 PSI
Rim type: Rimless
Primer: Large Pistol Magnum
Typical twist rate: 1:16
Muzzle velocity: 1200–1400 fps
Muzzle energy: 736–1131 ft-lbs
Effective range: 75 yd
Common bullet weights: 230, 260 gr
Primary use: Hunting, Self Defense
Production status: Active
Also known as: .45 WinMag · .45 NAACO
History: Introduced in 1979 by Winchester for Wildey Moore's gas-operated Wildey pistol. The cartridge offered a semi-automatic alternative to large-frame revolvers for hunting. The LAR Manufacturing Grizzly Win Mag also chambered it. Factory ammunition is still produced by Winchester but in limited quantities. The cartridge's followers are primarily handgun hunters who prefer the semi-automatic platform.
Notable firearms: Wildey Pistol, LAR Grizzly Win Mag
Similar cartridges: .45 ACP, .44 Magnum, .460 Rowland