23 × 115 mm

GSh-23 guns and later by the NK-23 Gatling-pattern gun. Description The case is rimless and bottlenecked, brass and percussion primed. Projectiles are of conventional design and weigh about 175 g. However, the rounds for early and later guns are not identical. Ammunition for the earlier NS gun was loaded to a lower velocity (690 m/s), while rounds for the AM, NT, GSh and NK series used a more powerful primer and an improved propellant to achieve 740 m/s. These latter rounds had the projectiles marked with a white band, but it seems that the only country now using the lower velocity round is the People's Republic of China , while other countries appear to have moderated the performance and settled on a somewhat lower velocity for the later guns. BULGARIA Manufacturer Arsenal Type: HEI: Steel shell with copper drive band, filled with AIX-2. Projectile tip coloured yellow. Brass case containing 4/7 CGR propellant and KV-3 primer. B-23 or B-23A PD nose fuze. Round weight 329 g, projectile weight 174 g; MV 690 m/s API: Solid steel projectile with copper drive band. Projectile tip colored silver. Round weight 321 g, projectile 156 g; MV 690 m/s CHINA , PEOPLE'S REPUBLIC Manufacturer China North Industries (NORINCO) Type: HE-I Type 2: Steel shell filled RDX; nose impact fuze with self-destruction; 180 g; MV 680 m/s (Type 1 gun), MV 705 m/s (Type 2, 2H) HE-T: Steel shell filled with RDX; nose impact fuze with self-destruction; cartridge weight 450 g; MV 970 m/s CZECH REPUBLIC Manufacturer State arsenals Type: HE-I-T OZT: Steel shell with HE filling, as Soviet pattern but with sintered iron driving band; K-20M nose impact fuze; 175 g; MV 740 m/s EGYPT Manufacturer Maasara Company for Engineering Type: HE-I-T: Appears to be based on the Soviet OZT; no details INDIA Manufacturer Indian Ordnance Factories, Ordnance Factory Khamaria Type: HE-I: No details available as preparing for full production API: No details available as preparing for full production TP-T: No details available as preparing for full production PAKISTAN Manufacturer Pakistan Ordnance Factories Type: HE-I: Steel shell, loaded RDX/Aluminium, and red tracer; nose impact fuze AP-24; 175 g; MV 720 m/s AP-I: Steel shell with alloy ballistic cap, filled incendiary composition; Unfuzed; 173 g; MV 720 m/s TP: HE-I shell body filled inert; dummy fuze; 173 g; MV 720 m/s MACEDONIA Manufacturer Euroinvest Type: HE M78 : Appears to be local derivative of a former Yugoslav round. Projectile weight 174 g; MV 720 m/s RUSSIAN FEDERATION AND ASSOCIATED STATES (CIS) Manufacturer Kemerovo Mechanical Plant Type: AP-I-T: Steel body and ballistic cap with copper rotating band; 175 g; MV 690 m/s Manufacturer PRIBOR Type: HE-I-T OZT: Boat tailed steel shell with HE filling (11 g RDX/Al) and K-20M nose impact fuze. Copper driving band. 175 g; MV 740 m/s HE-I-T-SD OZT/NZ: Similar to the OZT but using a flat-based shell of greater internal capacity and fitted with the NZ-231-A nose impact fuze with self-destruction after 17 seconds flight; 188 g; MV 700 m/s HE-I OZ: Boat tailed steel shell loaded RDX/Al; nose fuze K-20M; 175 g; MV 740 m/s HE-I OZ: Similar to the previous model OZ but with a stud on the base of the shell to which a short length of lead wire is twisted to act as a decoppering agent, the shell being marked with a yellow band to indicate this. Fuzed K-20M or B-23 impact HE-I OZ/VU: Similar to the OZT/NZ but without tracer and with a delay unit beneath the B-23 fuze to permit the shell to penetrate before detonation. AP-I BZ: Solid steel body with hard steel core and light steel ballistic cap containing incendiary composition; 200 g; MV 740 m/s AP-I-T BZ-A: Pointed steel shot with incendiary filling inside the light alloy ballistic cap; 195 g; MV 740 m/s APE: Contains 47 g of an unspecified explosive; 182 g; MV 720 m/s CC Cargo Carrying: Hollow steel shell containing 24 solid sub-projectiles each weighing 2 g to be ejected forward through the nose by a fixed time (1.4 to 1.8 seconds) VM-23 ejector assembly in the projectile base. Round weight 338 g; projectile 184 g; MV approx 700 m/s Radar jamming: Contains radar-jamming chaff dispensed through the projectile base over a period of 7 to 9 seconds. Projectile weight 184 g; MV 700 m/s IR Radiation: Radiates electro-magnetic waves in the 1.8 to 5 micron range to jam optical proximity fuzes and infra-red (IR) sensors. Time of waves generation is 0.8 to 1.2 seconds after firing for a duration of at least 3.8 seconds. Projectile weight 174 g; MV 700 m/s UKRAINE Manufacturer: MINIMASHPROM Type: HEI OFE: 184 g; MV 700 m/s AP-I BT: 190 g; MV 690 m/s YUGOSLAVIA , FEDERAL REPUBLIC Manufacturer Yugoimport SDPR Type: HE M85 : Steel shell loaded 16.3 g RDX/Aluminium; self-destroying fuze; 174 g; MV 720 m/s HE-T M85 : Two-section steel shell, 12 g RDX/Aluminium in front, red tracer in rear; nose impact self-destroying fuze; 175 g; MV 720 m/s HE-I M85 : Steel shell loaded 16.3 g RDX/Aluminium; self-destroying fuze; 174 g; MV 720 m/s HE-I-T M85 : Two-section shell loaded 12 g RDX/Aluminium in front, red tracer in rear; nose impact fuze with self-destruction; 175 g; MV 720 m/s AP-I M85 : Steel-pointed shell with incendiary mixture in ballistic cap and body filling of TNT/Al; base fuzed; 174 g; Mv 720 m/s AP-I-T M85 : As for AP-I but with red tracer; 174 g; MV 720 m/s TP M85 : Body of HE shell, empty; dummy fuze; 174 g; MV 720 m/s TP-T M85 : Body of HE-T shell, front section empty, rear section red tracer; dummy fuze; 174 g; MV 720 m/s