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The gun originated from a desire for a longer 12 in (30 cm) gun than the existing RML 12-inch 35-ton gun.Experiments in 1874 with both 12 in (30 cm) and 12.5 in (32 cm) versions 3 ft (91 cm) longer than the existing 12 in (30 cm) gun showed the 12.5 in (32 cm) calibre was more suitable, and further experiments showed a projectile of 800 lb (360 kg) could be fired with a charge of 130 lb (59 kg ...
13 mm» This is a list of firearm cartridges which have bullets in the 12 millimetres (0.47 in) to 12.99 millimetres (0.511 in) caliber range. Length refers to the cartridge case length.
Utyos-M machine gun turret mounted on the Ukrainian Sea Guard Zhuk-class patrol boat Darnytsia (BG116) Utyos-M: Naval twin 12.7 mm machine gun turret (used on Zhuk-class, Yaz-class, Vosh-class, Ogonek-class patrol craft, etc.). [8] 12.7 Itkk 96: Finnish designation. Guns acquired from Soviet Union, Russia and Germany (ex-Nationale Volksarmee). [9]
For comparison, the 12.7 mm Browning M2HB machine gun has up to 19 kJ (14,000 ft⋅lbf) with a 660 gr (43 g) bullet traveling at 3,080 ft/s (940 m/s) manufactured by PMC, the 20 mm ShVAK aircraft mounted gun has about 28 kJ (21,000 ft⋅lbf). It is one of the most powerful machine guns ever used by the Soviet and later Russian armed forces.
The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres ( 1 / 1 000 m = 0.001 m). To help compare different orders of magnitude, this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm). 1.0 mm – 1/1,000 of a meter; 1.0 mm – 0.03937 inches or 5/127 (exactly)
The high penetration VKS round can penetrate up to 16 mm (0.63 in) of steel at 200 metres (220 yd) or body armor up to GOST 5 or NIJ III at 100 metres (110 yd). The accuracy of this cartridge when loaded with precision VKS bullets is claimed to be one MOA at 100 metres (110 yd) up to the effective range limit of 690 metres (750 yd).
The 12.7 × 108 mm has 22.72 ml (350 grains) H 2 O cartridge case capacity. 12.7 × 108 mm maximum cartridge dimensions. [citation needed] All sizes in millimeters (mm). Americans define the shoulder angle at alpha/2 ≈ 18.16 degrees. According to guidelines the 12.7 × 108 mm case can handle up to 360 MPa (52,213 psi) piezo pressure.
In foreign use the AN/M2 is often just referred to as the M2 Browning. In Sweden it was re-designated 12,7 mm automatkanon m/45 (short 12.7mm akan m/45) meaning 12.7 mm autocannon m/45. [87] The Swedish Air Force used a different designation system which recognized the incendiary rounds as grenades, thus it was called autocannon. [87]