9mm Winchester Magnum

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9mm Winchester Magnum
Place of originUnited States
Production history
Case typeRimless, straight
Bullet diameter.355 in (9.0 mm)
Neck diameter.379 in (9.6 mm)
Base diameter.391 in (9.9 mm)
Rim diameter.394 in (10.0 mm)
Rim thickness.050 in (1.3 mm)
Case length1.160 in (29.5 mm)
Overall length1.575 in (40.0 mm)
Maximum pressure (CUP)45,000 psi (310 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
115 gr (7 g) MC 1,450 ft/s (440 m/s) 537 ft⋅lbf (728 J)
Source(s): SAAMI [1]

The 9mm Winchester Magnum, which is also known as the 9×29mm, is a centerfire handgun cartridge developed by Winchester in the late 1970s. The cartridge was developed to duplicate the performance of the .357 S&W Magnum in an auto-pistol cartridge.[2]

The first handgun which chambered the cartridge was the Wildey pistol. Since then, Thompson/Center has produced barrels chambered for this cartridge and AMT chambered their Automag III[3] for it too, but the cartridge never reached the popularity enjoyed by other handgun cartridges.[citation needed]

Starline Brass in Sedalia, Missouri, still make brass for this cartridge, although much of its production is now used to make 9mm blank firing cartridges for firearms chambered for 9×19mm, as this is easier to accomplish than using .223 Remington (5.56×45mm) cases, which may leave the neck area of the blank too thick to crimp properly. 9mm Winchester Magnum cases can also be trimmed and resized for reloading 9×25mm Mauser.

See also[edit]


  1. ^ "SAAMI - Velocity and pressure data / centerfire pistol and revolvers cartridges, p. 11" (PDF). Archived from the original (PDF) on 16 October 2013. Retrieved 13 May 2012.
  2. ^ Taffin, John. "Taffin Tests 9mm Magnum". sixgun.com. John Taffin. Retrieved 15 May 2011.
  3. ^ http://world.guns.ru/handguns/hg/usa/amt-automag-ii-v-e.html