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0.300 Winchester Magnum

Region
South Africa
United States
Finland
Norway
Sweden
Austria
Germany
Switzerland
Category
Ammunition, Missiles and precision weapons
The case is belted and bottlenecked brass, Boxer primed. The belt acts as a positive chambering stop and also reinforces the case against internal pressure. Hunting bullets are usually of pointed soft point design, but military cartridges utilize either full metal jacketed or jacketed hollow point match bullets. This cartridge was introduced in 1963 for the Winchester Model 70 bolt-action hunting rifle, after which it was used by several US and European rifle makers. It proved to be a very accurate and consistent
long-range round with a flat trajectory; because of this it has been adopted by a number of military and security forces as a sniping round. Military development of this round was undertaken by the US Navy in the late 1980s when their special operations units began seeking a long-range anti-personnel cartridge that improved upon the ballistics of the 7.62 × 51 mm cartridge. The Navy's requirement was for a cartridge with an extreme spread of less than 203 mm at 550 m and less than 89 mm at 275 m. Muzzle velocity was specified at 900 m/s, plus or minus 15 m/s. Current US Military specification calls for a velocity of 914 m/s using a 12.3 g Sierra Match King bullet with sub-minute of angle accuracy across the bullet's effective range. The 0.300 Win Mag fills an operational capability divergence between the 7.62 × 51 mm round, which is effective to only about 800 m and the .50 BMG (12.7 × 99 mm) round, whose accuracy and signature make it less desirable in the 800 to 1200 m ranges. The 'pin point' accuracy and relatively low signature of the current military round make it ideal for use in the 800 to 1200 m spectrum. A recent development for sniper use is the Swiss Munitions family of cartridges in this calibre; these are ballistically matched out to a range of 250 m. Applications include suitably chambered rifles.