23×115mm
The 23×115mm round is used in Soviet (USSR)/Russian/CIS aircraft autocannon. Although superseded by the 30×165mm round the Russian Air Force still uses it in the GSh-23L (in the aircraft's tail turrets and in the UPK-23-250 gun pod) and the GSh-6-23 (in the Su-24). This round still serves in many countries and is widely available. The projectile weight is 175 grams. History The round was derived from the 14.5×114mm round by necking it out to 23 mm. The original rounds used a lower power charge of 33 g of sw 4/7 powder and achieved 690 m/s at a maximum pressure of 294.3 MPa. 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 the An-2, Il-10, Il-22, La-9, La-11, La-15, MiG-9, Yak-7, Yak-9U, Yak-15, Yak-17, and Yak-23 fighters; and in the Mi-2US, Mi-2URN, and Mi-2URP helicopters. Nudelman-Rikhter NR-23, used in the MiG-15, MiG-17, and La-15 fighters. Afanasev Makarov AM-23, used in the Tu-16, Tu-95, Il-54 bombers; and in the An-8, An-12, Il-76 transports. Gryazev-Shipunov GSh-23, used in the MiG-21, MiG-23, SOKO J-22 Orao, HAL Tejas, and IAR 93 fighters; in