Top definition
One of NATO's military firearm calibers. The 7.62x51mm NATO cartridge is often used in allied (American, UK, German, French, etc) machine guns, sniper rifles, and even a few assault rifles (such as Heckler & Koch's G3A3).
The civilian 7.62x51mm NATO round is the .308 Winchester.
by Dave February 01, 2004
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