23×115mm

The 23x115 mm round is used by Soviet(USSR)/Russian/CIS aircraft autocannon, most notably by the GSh-23L and GSh-6-23. Although the round has been superseded by the 30x165 mm round, the Russian Air Force still uses it in the GSh-23L (in aircraft's tail turrets and in the UPK-23-250 gunpack/gunpod) and GSh-6-23 (used in Su-24). This round still serves in many countries and is widely available.

History
The round was derived from the 14.5×114mm round by necking it out to 23mm. The original rounds used a lower power charge of 33g of sw 4/7 powder and achieved only 690 m/s at a maximum pressure of 294,3MPa. In 1954 an improved ammunition was introduced, featuring better projectile design and ballistic properties. The newer rounds have a powder charge to achieve 720 m/s.

Weapon Platforms

 * Nudelman-Suranov NS-23, used in An-2, Il-10, Il-22, La-7, La-15, MiG-9, Yak-7, Yak-9U, Yak-15, Yak-17, and Yak-23 planes.
 * Nudelman-Rikhter NR-23, used in MiG-15, La-15, MiG-17.
 * Afanasev Makarov AM-23, used in Tu-16, Tu-95, Il-54 bombers, and An-8, An-12, Il-76 transports.
 * Gryazev-Shipunov GSh-23, used in MiG-21, MiG-23, SOKO J-22 Orao, HAL Tejas, IAR 93 fighters, Tu-22M and Tu-95 bombers, W-3WA Sokół helicopter, Il-76 transport and in the UPK-23-250 gunpods.
 * Gryazev-Shipunov GSh-6-23, used in Su-15, Su-24, MiG-31 and early versions of the MiG-27.