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Concept
14.5×114mm
Summary
The 14.5×114mm (.57 calibre) is a heavy machine gun and anti-materiel rifle cartridge used by the Soviet Union, the former Warsaw Pact, modern Russia, and other countries.
It was originally developed for the PTRS and PTRD anti-tank rifles, and was later used as the basis for the KPV heavy machine gun that formed the basis of the ZPU series anti-aircraft guns that is also the main armament of the BTR series of armoured personnel carriers from the BTR-60 to the BTR-80 and for heavy anti-materiel sniper rifles.
The 14.5×114mm has 42.53 ml (655 grains H2O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under extreme conditions.
14.5×114mm maximum cartridge dimensions. All dimensions in millimetres (mm).
Americans define the shoulder angle at alpha/2 = 22.5 degrees. The common rifling twist rate for this cartridge is 455 mm (1 in 17.91 in), 8 grooves, ⌀ lands = 14.50 mm, ⌀ grooves = 14.95 mm.
According to the official guidelines the 14.5×114 case can handle up to 360 MPa (52,213 psi) piezo pressure. In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to be certified for sale to consumers.
BS: Armour-piercing incendiary original anti-tank round. The projectile weighs 64.4 grams and is 51 millimetres long with a 38.7 gram core of tungsten carbide with 1.8 grams of incendiary material in the tip. The overall round weighs approximately 200 grams and is 155 millimetres long. The projectile has a muzzle velocity of approximately 1,006 metres per second and can penetrate 30–32 millimetres of RHA steel at an incidence of 0 degrees at a range of 500 metres, or 40 millimetres at a range of 100 metres.
B-32: Armour-piercing incendiary full metal jacket round with a hardened steel core. Projectile weight is 64 g and muzzle velocity is 1,006 m/s. Armour penetration at 500 m is 32 mm of RHA at 90 degrees.
BZT: Armour-piercing incendiary tracer full metal jacket round with a steel core.
Official source
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