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Concept
9×23mm Steyr
Summary
The 9×23mm Steyr, also known as 9mm Steyr, is a centerfire pistol cartridge originally developed for the Steyr M1912 pistol.
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. 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.
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.
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.
Image:Steyr Hahn M1912.JPG|Steyr M1912 pistol with holster and 9×23mm Steyr ammunition on stripper clips
Image:Steyr-Hahn M1912.JPG|Steyr M1912 pistol with box and stripper clip of 9×23mm Steyr ammunition
Image:9x23mm_Largo_comparison.
Official source
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