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It is a rifle that is chambered for a .30 in. diameter projectile (.30 caliber) fired with a case , primer,and powder load designed in 1906. It was designed for the US Military to replace the .30-40 Krag with the intention of closer approximating the ballistics of the 7 X57 mm Mauser cartridge used by the Spanish forces in the Spanish-American War. It remained the first line US battle rifle caliber from the beginning of WWI until it was retired in the 1970s. The actual diameter of the projectile is .308 in.

The caliber lives on to this day as the .308 Winchester, 7.62 X 51 mm NATO, with a redesigned cartridge case allowing it's use in NATO weapons. The ballistics are only slightly less than those of the venerable .30-06

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13y ago

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