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.45 Winchester Magnum

American pistol cartridge

Field	Value
name	.45 Winchester Magnum
image	Wildey Cartridges.JPG	image_size = 250px
caption	A lineup of Wildey cartridges, with the .45 Winchester second from left.
origin	United States
type	Pistol
designer	Winchester
design_date	1977
manufacturer	Winchester
production_date	1979–present
parent	.45 NAACO
case_type	Rimless, straight
bullet	.452
neck	.473
base	.476
rim_dia	.480
rim_thick	.072
case_length	1.198
length	1.575
case_capacity	38
primer	Large pistol
max_pressure	40000
pressure_method	SAAMI
bw1	230
btype1	JHP Underwood
vel1	1600
en1	1307
bw2	255
btype2	HC FN Buffalo Bore
vel2	1400
en2	1110
bw3	260
btype3	Power-Point Winchester
vel3	1200
en3	831

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.{{cite web

The cartridge has been primarily used by small game hunters and metallic silhouette shooters.

Specifications

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 copper units of pressure) than that of the .45 ACP (18,000 copper units of pressure, 21,000 psi, or 140 MPa).

History

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 cartridge was also chambered for the Freedom Arms Model 83 single-action revolver via an available optional cylinder.

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.

References

Wahl, Paul. (1980). "First Gas Operated Semi-Auto Pistol". [[Popular Science]].
(29 Oct 2009). "Freedom Arms Inc. Revolver Specifications".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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