9mm Winchester Magnum
Encyclopedia
The 9 mm Winchester Magnum, which is also known as the 9x29mm, is a centerfire
Centerfire ammunition
A centerfire cartridge is a cartridge with a primer located in the center of the cartridge case head. Unlike rimfire cartridges, the primer is a separate and replaceable component....

 handgun
Handgun
A handgun is a firearm designed to be held and operated by one hand. This characteristic differentiates handguns as a general class of firearms from long guns such as rifles and shotguns ....

 cartridge
Cartridge (firearms)
A cartridge, also called a round, packages the bullet, gunpowder and primer into a single metallic case precisely made to fit the firing chamber of a firearm. The primer is a small charge of impact-sensitive chemical that may be located at the center of the case head or at its rim . Electrically...

 developed by Winchester
Winchester Repeating Arms Company
The Winchester Repeating Arms Company was a prominent American maker of repeating firearms, located in New Haven, Connecticut. The Winchester brand is today used under license by two subsidiaries of the Herstal Group, Fabrique Nationale of Belgium and the Browning Arms Company of Morgan, Utah.-...

 in the late 1970s. The cartridge was developed to duplicate the performance of the .357 S&W Magnum
.357 Magnum
The .357 S&W Magnum , or simply .357 Magnum, is a revolver cartridge created by Elmer Keith, Phillip B. Sharpe, Colonel D. B. Wesson of firearms manufacturer Smith & Wesson, and Winchester. It is based upon Smith & Wesson's earlier .38 Special cartridge. The .357 Magnum cartridge was introduced in...

 in an auto-pistol cartridge.

The first handgun which chambered the cartridge was the pistol was the Wildey
Wildey
The Wildey is a gas operated, double action/single action, selective fire pistol designed by Wildey J. Moore. The pistol was designed to fire several high pressure proprietary cartridges including the .45 Wildey Magnum and the .475 Wildey Magnum.-Action:...

 pistol. Since then, Thompson/Center has produced barrels chambered for this cartridge and AMT chambered their Automag III for it too, but the cartridge never reached the popularity enjoyed by other handgun cartridges and could now be considered obsolete.

The cartridge is capable of firing a 147 gr bullet at 1370 ft/s (417.6 m/s).
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