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7.62 × 62.8 mm
Категорія
Боєприпаси, ракети та високоточне озброєння
The 7.62 × 62.8 mm is an armament S4M Pistol. Development This cartridge is apparently a development similar in concept to the 7.62 × 35 mm SP-3, which was used in the MSP Pistol. The exact relationship between the two cartridges and the weapons that chamber them is unclear, but both were developed in the 1970s for Soviet special operations forces, when an absolutely silent firearm was required. The SP-3 was used in the MSP pistol and the 7.62 × 62.8 mm in the S4M pistol. Both the MSP and S4M pistols are small,
easily concealed, two-barrelled derringer-type pistols used operationally in Afghanistan and Central America, respectively. The design of the cartridge precludes its use in a semi-automatic pistol, as the piston which protrudes after firing prevents extraction and ejection through a conventional port. The subsequent 7.62 × 42 mm SP-4 silent cartridge resolved this problem and it is presumed that it may have replaced both this and the SP-3 in Russian service. However, either cartridge may still be encountered in areas where Soviet/Russian forces were present or in areas of the world Soviet/Russian clandestine services operate because unlike the semiautomatic PSS pistol that fires the SP-4 cartridge, the MSP and S4M are completely silent. Description The cartridge case is a straight taper rimless design, highly unusual in that it contains the firing pin and primer in its base. A version of this cartridge with a slight bottleneck has also been reported. The case walls are very thick to contain the powder gases which remain inside after the cartridge is fired. Upon firing, a piston propels the conventional bullet and remains extended. The piston obturates inside the case and seals it gastight so that the cartridge is absolutely silent upon firing, save for the snap of the firing pin. The bullet is seated very deeply in the case and protrudes only slightly from the case mouth prior to firing. It is identical in appearance to the M1943 7.62 × 39 mm ball bullet. This cartridge and its associated pistol have been referred to as the 'PZAM', but this acronym has not been confirmed, nor has the cartridge's official Russian designation been made public. RUSSIAN FEDERATION Manufacturer Tula Ammunition Factory Type: Ball: FMJ; 8 g; MV 835 m/s.