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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 ...
By necking down the cartridge 14.5x114mm to accept 50 BMG, 12.7x114mmHL was created, with a muzzle velocity of 3,280 feet per second (1,000 m/s). MCR Horizon's Lord was also designed to be adaptable in comparison to other similar rifles. It can switch between the previously mentioned calibers on the field, sometimes only requiring a barrel change.
The KPV was a heavy machine gun developed by S. V. Vladimirov. It was developed in 1944 and adopted in 1949. It combines the rate of fire of a heavy machine gun with the armor-piercing capabilities of antitank rifles and was designed to combat lightly armored targets, firepower and manpower of the enemy located behind light cover, as well as to be an anti-aircraft machine gun.
The 14.5mm armour-piercing bullet has a muzzle velocity of 1,013 m/s (3,320 ft/s) and devastating ballistics. It can penetrate an armour plate up to 40 mm (1.6 in) thick at a distance of 100 m (330 ft). [4] In 1943 Simonov used a scaled-down PTRS-41 design for the SKS, that would accommodate the new 1943-designed 7.62×39mm cartridge.
All weapons in the ZPU series have air-cooled quick-change barrels and can fire a variety of ammunition including API (B32), API (BS41), API-T (BZT) and I-T (ZP) projectiles. Each barrel has a maximum rate of fire of around 600 rounds per minute, though this is practically limited to about 150 rounds per minute.
I think "14.5mm" ought to direct you to this page, since that's what most people are probably looking for, and the average person doesn't know the full designation. If they'd like to read about the KPV machine gun or PTSR-41, or even the super-rare "14.5mm JDJ", they can find a link to it here.