9×23mm Steyr

• Name — 9×23mm Steyr • Origin — Austria-Hungary • Type — Pistol • Used By — Austro-Hungarian Army • Designer — Œ.W.G. • Production Date — 1911 • Is Si Specs — yes • Case Type — Rimless, straight • Bullet — 9.03 • Neck — 9.62 • Base — 9.70 • Rim Dia — 9.70 • Rim Thick — 1.25 • Case Length — 23.20 • Length — 32.99 • Primer — Small pistol • Bw1 — 115 • Btype1 — FMJ • Vel1 — 1025 • En1 — 268 • Bw2 — 115 • Btype2 — FMJ • Vel2 — 1080 • En2 — 298 • Bw3 — 115 • Btype3 — FMJ • Vel3 — 1230 • En3 — 388 • Test Barrel Length — 128 mm • Balsrc — 1. Hornady; 2. Fiocchi; 3. Hirtenberger

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.

section 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.

• Illustration — Steyr M1912 pistol with holster and 9×23mm Steyr ammunition on stripper clips • Illustration — Steyr M1912 pistol with box and stripper clip of 9×23mm Steyr ammunition • Illustration — Left to right: 9×23mm Largo, 9×19mm Parabellum, 9×23mm Winchester, and 9×23mm Steyr