Winchester 7.62x51mm M80


The round was developed for ballistics that could compete with the .30-06 (7.62x63mm), but in a shorter action than that of the .30-06. That shorter action is possible because of the shorter case of the 7.62 NATO (51mm versus the .30-06’s 63mm). While the .308 comes close in velocity, the .30-06 still beats it by being about 100 feet per second faster.