23×152mmB

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23×152mmB
23×152mmB API (left) and HEI (right)
Type	Autocannon
Place of origin	Soviet Union
Service history
Used by	Historically: USSR, Warsaw Pact Contemporarily: second-, and third-world countries
Production history
Designed	1941
Specifications
Case type	Belted, bottlenecked
Bullet diameter	23 mm (0.91 in)
Neck diameter	23.7 mm (0.93 in)
Shoulder diameter	31.3 mm (1.23 in)
Base diameter	33.2 mm (1.31 in)
Rim diameter	34.6 mm (1.36 in)
Rim thickness	33.4 mm (1.31 in)
Case length	151 mm (5.9 in)
Overall length	235.6 mm (9.28 in)
Maximum pressure	2925 kgf/cm2[1]
Ballistic performance
Bullet mass/type Velocity Energy 190 g (2,932 gr) BZ API 980 m/s (3,200 ft/s) 88,917 J (65,582 ft⋅lbf)
Test barrel length: 2008mm

The 23×152mmB^[2] is a large-caliber cartridge used by the USSR/CIS in the VYa-23 aircraft autocannon the Ilyushin Il-2 ground attack aircraft and in the 2A7 and 2A14 autocannons on the ZU-23-2 anti-aircraft gun series and ZSU-23-4 "Shilka", among others.

Note that the ammunition for the VYa-23 uses a brass case and is not functionally interchangeable with the steel-cased ammunition of the modern ZU-23 anti-aircraft gun series. These two weapons use different headspace sizes, therefore requiring ammunition of slightly different dimensions.^[3] While it is no longer in use in the main anti-aircraft weapons of modern Russia, being replaced by the 30×165mm, it is still in service with the Russian Naval Infantry and many other countries.

Iran has produced the Baher anti-material rifle chambered for this round. The stated purpose is to take down helicopters and vehicles.^[4]

• 23×115mm, used mainly in aircraft weapons such as bomber defense guns and fighter aircraft