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The two differ in bullet shape and weight, and the casing of the 12.7 × 108 mm is slightly longer, and its larger case capacity allows it to hold slightly more of a different type of powder. The 12.7 × 108 mm can be used to engage a wide variety of targets on the battlefield, and will destroy unarmored vehicles, penetrate lightly armored ...
The differences between the two are the bullet shape, the types of powder used, and that the case of the 12.7×108mm is 9 mm longer and marginally more powerful. 14.5×114mm : The 14.5×114 mm is a heavy machine gun and anti-materiel rifle round used by the Soviet Union, the former Warsaw Pact, modern Russia, and other countries.
The 12.7×55mm cartridge is used in some Russian firearms such as the VKS bullpup sniper rifle, the ShAK-12 bullpup battle rifle and the RSh-12 revolver. The cartridge can carry a projectile weighing between from 108 grains and 1173 grains and is predominantly used to fire heavy subsonic loads.
Ammunition, and the components thereof, can be categorized in an assortment of fashions. Among other ways, it may be approached according to the shape, the mass, the dimensions of a projectile or cartridge, the customary charge of powder, velocity, intended purpose, and recommended applications.
'Assault revolver calibre 12.7') is a Russian-made revolver chambered in 12.7×55mm STs-130. It fires from the bottom chamber of the cylinder (like the Chiappa Rhino and Mateba Autorevolver) rather than the more common top chamber, and is chambered for the same ammunition as the ShAK-12 battle rifle and VKS rifle.
Black powder produces gas at a predictable rate unaffected by pressure, while the gas production rate of smokeless powder increases with increasing pressure. [6] The possibility of runaway pressures caused smokeless powder to destroy many firearms designed for black powder and required much more precise measurement of propellant charges.
The test cartridge must be inserted into the chamber in such a way that the hole in the test cartridge case lines up with a gas port hole that channels the gas pressure from the cartridge case to the face of the sensor. The measurement accuracy of the pressure measurements with 21st century high-pressure sensors is expected to be ≤ 2%. [7]
12.7 mm (12.7×99mm NATO) Designed to chamber NATO ammunition: 417.0 / (60,481) 521.3 / (75,608) Pressure recorded in NATO design EPVAT Barrel with Kistler 6215 Transducer, HPI GP6 Transducer or by equipment to C.I.P. requirements All other small arms ammunition for use in "non-NATO Chamber" weapons: As defined by the current C.I.P. legislation.