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The 9mm Steyr is a centerfire pistol cartridge originally developed for the Steyr M1912 military pistol. Adopted in 1912, this 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 9mm Mauser. When the Austrian Army was incorporated in the Wehrmacht in 1938 following the Anschluss, many M1912 pistols and MP 34 submachine guns were rebarrelled to 9×19mm Parabellum for standardization purposes.

9×23mm Steyr [1]
9x23mm Steyr.jpg
Place of originAustria-Hungary
Service history
Used byAustro-Hungarian Army
Production history
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
Steyr Hahn M1912 show with 9×23mm Steyr ammunition on stripper clips.

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

Left to right: 9×23mm Largo, 9×19mm Parabellum, 9×23mm Winchester, and 9×23mm Steyr.

Reloadable, Boxer-primed cartridge cases can be made from 5.56x45mm 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. RCBS apparently can produce such a forming die set, complete with reamer. Loading data would be much like .38" ACP.[citation needed]


  1. ^ "9mm Largo vs. Others". Archived from the original on 2008-06-25. Retrieved 2009-07-10.
  2. ^ *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.