9×23mm Steyr

The 9×23mm Steyr, also known as 9mm Steyr, is a centerfire pistol cartridge originally developed for the Steyr M1912 pistol.

9×23mm Steyr[1]
TypePistol
Place of originAustria-Hungary
Service history
Used byAustro-Hungarian Army
Production history
DesignerŒ.W.G.
Produced1911
Specifications
Case typeRimless, straight
Bullet diameter9.03 mm (0.356 in)
Neck diameter9.62 mm (0.379 in)
Base diameter9.70 mm (0.382 in)
Rim diameter9.70 mm (0.382 in)
Rim thickness1.25 mm (0.049 in)
Case length23.20 mm (0.913 in)
Overall length32.99 mm (1.299 in)
Primer typeSmall pistol
Ballistic performance
Bullet mass/type Velocity Energy
115 gr (7 g) FMJ 1,025 ft/s (312 m/s) 268 ft⋅lbf (363 J)
115 gr (7 g) FMJ 1,080 ft/s (330 m/s) 298 ft⋅lbf (404 J)
115 gr (7 g) FMJ 1,230 ft/s (370 m/s) 388 ft⋅lbf (526 J)
Test barrel length: 128 mm (5.0 in)
Source(s): 1. Hornady; 2. Fiocchi; 3. Hirtenberger

History

Adopted in 1912, the 9mm Steyr was the service ammunition for most branches of the military in Austria-Hungary during World War I and remained the service ammunition for Austria, Romania and Chile between the World Wars.[2] Some MP 34 submachine guns were also issued in this caliber in addition to 9×25mm Mauser. When the Austrian Army was incorporated in the Wehrmacht in 1938 following the Anschluss, many Steyr M1912 pistols and MP 34 submachine guns were rebarrelled to 9×19mm Parabellum for standardization purposes.

Design

The cartridge headspaces on the mouth of the case. Its performance is close to that of the .38 ACP. Unrelated to the modern 9×23mm Winchester, it is similar to the 9×23mm Largo cartridge in performance, but their dimensions are just different enough to make them non-interchangeable.[3]

Handloading

For handloading, reloadable Boxer-primed cartridge cases can be made from 5.56×45mm NATO brass. This requires inside neck-reaming, as such a conversion would otherwise leave unacceptably thick mid-to-rear case walls from the original cartridges to form the mouths of the new, shortened cases. At least one commercial source apparently can produce such a forming die set, complete with reamer. Loading data would be much like .38 ACP.

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References
  1. "9mm Largo vs. Others". Archived from the original on 2008-06-25. Retrieved 2009-07-10.
    • Wilson, R. K. Textbook of Automatic Pistols, p.235. Plantersville, S.C.: Small Arms Technical Publishing Company, 1943.
  3. Jeff, John (August 2009). "Q&A". Guns Magazine. p. 35.
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