The 7.62-mm special cartridge SP.3 [1] or 7.62 × 35 SP.3 [1] or just SP-3 [2] is a Soviet silent closed-type ammunition for firing from a special small-sized pistol of a small- arms gun and a reconnaissance knife firing LDCs . Also known under the designations 7.62 × 38 mm SP-3 [3] [4] and 7.62 × 38 mm SP.3 [5] . Created in 1965-66 by the engineer TsNIITochMash E. T. Rozanov, adopted for service in 1972 [1] . Produced at factories No. 62 and No. 711 ( Klimovsky stamping ); cartridge packages (10 pieces with five clips each) bear the symbol “7.62-СП-3 ГЖ”, and cartridge cartridges do not have a standard bottom mark [1] [2] .
| SP-3 | |
|---|---|
| Cartridge type | pistol |
| Producing country |  the USSR |
| Service History | |
| Used | the USSR |
| Production history | |
| Constructor | E. Rozanov ( TsNIItochmash ) |
| Time of creation | 1965-66th |
| Manufacturer | Klimovsky stamping plant , etc. |
| Specifications | |
| Cartridge weight, g | 14.52-15.82 |
| Cartridge Length, mm | 52.0 |
| Real bullet caliber , mm | 7.92 |
| Bullet weight, g | 7.9 |
| Muzzle velocity , m / s | 145 ± 5 |
| Liner parameters | |
| Sleeve shape | bottle |
| Sleeve length mm | 34.8 |
Content
Creation History
Ammunition SP-3 appeared as a result of a series of works on the modernization of the cartridge SP-2 for a double-shot pistol MSP [2] . The main purpose of modernization was to mislead regarding the very use of special weapons. To do this, in a new silent munition, a special bullet was replaced with a standard bullet from the Soviet 7.62 × 39 mm machine gun cartridge of the 1943 model [2] . Despite all efforts, the bullet of the created cartridge after the shot retained the signs of firing from special weapons, since the barrel of the machine gun left on it traces of four rifling, and the gun - six [2] .
Design Features
The bimetallic sleeve of the SP-3 cartridge is inherited from the SP-2 cartridge [1] and is equipped with a standard automatic bullet of 7.62 × 39 mm caliber [2] . As a propellant charge, the porous pyroxylin powder composition of the P-125 grade (0.12 grams) was chosen [1] . The igniter capsule is fixed in the bottom of the sleeve by reinforced annular compression [2] . The joints of the bullet / sleeve and sleeve / capsule are varnished with Bordeaux color [2] .
To increase the initial velocity of the bullet, a two-element telescopic pallet of the original design is placed inside the sleeve [2] . When fired, acting as a piston, the pan pushes the bullet out and wedges in the neck of the cartridge case, locking powder gases and providing noiseless, flameless and smokeless firing. Moreover, the length of the sleeve increases from 35 to 55 mm, which greatly complicates the development of automatic weapons for this munition [1] . The residual pressure of the powder gases in the liner after the shot is about 400-600 kgf / cm 2 [6] .
Notes
- ↑ 1 2 3 4 5 6 7 Dick V. N. Cartridges for silent firing of closed type // Explosives, gunpowder and ammunition of domestic production. - Minsk: Okhotkontrakt, 2009. - T. 1. - S. 91. - 280 p. - 1000 copies. - ISBN 978-985-6911-02-9 .
- ↑ 1 2 3 4 5 6 7 8 9 Solovtsov E. V. Silent cartridge "SP-3" // Russian ammunition. Special silent and 9 mm pistol cartridges. . - Pushkino: Center for Strategic Conjuncture, 2015 .-- S. 23. - 156 p. - ISBN 978-5-9906069-9-9 .
- ↑ Cartridge 7.62X38 SP-3 . Thematic portal "Encyclopedia of weapons" (July 3, 2010). Date of treatment February 24, 2016.
- ↑ Maxim Popenker. Silent cartridges SP-3 and PZAM (inaccessible link) . Information portal world.guns.ru (2008). Date of treatment February 24, 2016. Archived on September 10, 2014.
- ↑ Shunkov V. SME "Thunderstorm" // Combat and service weapons of Russia. - M .: EKSMO, 2012 .-- S. 294-295. - 520 s. - ISBN 978-5-699-53557-6 .
- ↑ Ponomarev Yu. SME. Russian “derringer” or “pocket boxflint”? (Russian) // Kalashnikov: journal. - 2005. - March ( No. 09 ). - S. 6-11 .
Links
- Cartridge 7.62x35 mm SP-3 . Thematic portal "Armory Truth". Date of treatment February 24, 2016.
- Cartridge SP-1 / SP-2 / SP-3 / SP-4 / SP-5 / SP-6 . Thematic portal "Military materials". Date of treatment February 24, 2016.
- Silent cartridges SP-3 and PZAM . Website of the Russian Special Forces Veterans Community Special Forces .org. Date of treatment February 26, 2016.
- Ammunition for special purposes . Armory site www.gunza.ru . Date of treatment February 24, 2016.