.45 Winchester Magnum

Common card · No. 251275

The .45 Winchester Magnum is a .45 caliber rimless cartridge intended for use in semi-automatic pistols. The cartridge is an externally lengthened .45 ACP with a thicker web to withstand higher operating pressures. The 45 Win Mag is nearly identical in dimensions and loading to the .45 NAACO developed by the defunct Canadian firm NAACO (North American Arms Corporation) for their Brigadier pistol, developed to supply to the Canadian Army after World War II. The army ultimately did not adopt the pistol and its non-NATO standard ammunition. The cartridge has been primarily used by small game hunters and metallic silhouette shooters.

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