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|.45 Winchester Magnum|
A lineup of Wildey cartridges, with the .45 Winchester second from left.
|Place of origin||USA|
|Parent case||.45 NAACO|
|Bullet diameter||.452 in (11.5 mm)|
|Neck diameter||.473 in (12.0 mm)|
|Base diameter||.476 in (12.1 mm)|
|Rim diameter||.480 in (12.2 mm)|
|Rim thickness||.049 in (1.2 mm)|
|Case length||1.198 in (30.4 mm)|
|Overall length||1.575 in (40.0 mm)|
|Case capacity||38 gr H2O (2.5 cm3)|
|Maximum CUP||40,000 CUP|
The .45 Winchester Magnum is a .45 caliber rimless cartridge intended for use in semi-automatic pistols. The cartridge is externally a 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 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.
Although, the .45 Winchester Magnum may be based on the .45 ACP and have the same Rim and Base dimensions, the .45 Winchester Magnum has no parent case. The .45 Winchester Magnum case is redrawn with thicker walls and longer case. The thicker wall dimensions of the .45 Winchester Magnum are designed to accommodate a higher internal pressure (40,000 cup) than that of the .45 ACP (18,000 cup [21,000psi or 140MPa]).
The .45 Winchester Magnum had been on the drawing board for two years before its introduction, in 1979, by Winchester. The cartridge did not gain much popularity due to the intermittent availability of the Wildey and LAR Grizzly pistols. The cartridge was chambered in the Thompson-Center Contender single shot pistols.
The .45 Winchester Magnum gained a following among IHMSA competitors as it provided the power and performance necessary to knock down targets at an extended range. The cartridge has been used by handgun hunters and is among the few semi-automatic pistol (as opposed to revolver) cartridges which have been adopted for this sport.