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76 mm FRAG-HE OF-350 and O-350A
Регіон
Romania
Категорія
Ammunition, Missiles and precision weapons
The 76 mm (actual calibre 76.2 mm) FRAG-HE OF-350 and O-350A, are fixed rounds with the projectile rigidly fixed to the cartridge case by a 360º crimping band located in a cannelure close to the single copper drive band which is 13.72 mm wide. The projectile is a hollow steel forging with a threaded nose cavity for the point detonating fuze. The ogive is long and streamlined and there is a bourrelet and a boat tail. The usual filling is 710 g of TNT although other explosives have been used. The straight-sided
cartridge case is extruded brass (lacquered steel has been used) and contains approximately 1.08 kg of loose-filled 9/7 nitrocellulose powder plus 12 g of S-1 decoppering agent, and a distance piece and obturator to fill the gap between the propellant and the projectile base. A 25 mm brass percussion primer housing is threaded into the base. The muzzle velocity is 680 m/s, producing a range of approximately 13,300 m. When fired from the Romanian Mountain Howitzer Model 84 at a maximum muzzle velocity of 398 m/s, the maximum range is given as 8,600 m. A blank MK-354 cartridge was produced for training and saluting purposes. It weighed 1.5 kg and contained 150 g of 9/7 propellant to produce the sound and flash signatures required. Many nations manufacture their own Blank cartridges using fired cartridge cases. The 76 mm Divisional Field Gun M1942 (ZIS-3) was one of the stalwarts of the Red Army's close artillery support regiments during the 1941-1945 Great Patriotic War and was produced in thousands. The main projectile employed throughout its service life was FRAG-HE, of which the OF-350 and O-350A were the latest types. The OF-350 and O-350A are visually identical although the O-350A is marginally shorter. The 42 calibre ZIS-3 and its ammunition are now generally regarded as obsolete, due mainly to the low projectile weight, although the ZIS-3 and its Chinese equivalent, the 76 mm Type 54, remain in service with some nations, sometimes as an anti-armour weapon. It no longer serves with any of the former Warsaw Pact nations other than as a Blank-firing saluting gun or gate guardian.