AHM. If, by your question, can you shoot 7.62 Nato in your .308 Win. rifle? Yes. They are, for all practical purposes, the same cartridge.
Winchester brought out the .308 about a year prior to the military's final acceptance of the round. About the only real difference is military brass is usually heavier and the primers are crimped in place for use in automatic weapons. Because military brass is heavier, case capacity is less, and slightly lighter charges should/must be used when reloading them. Also the crimp must be removed before repriming military brass. There are tools and swaging equipment to do this, but I use a chamfering tool for this little chore and it works well for me.
BTW. There is military brass and Nato brass. Nato brass has the circle with the cross emblem stamped on the head. Kind of looks like the crosshairs in a scope. Still all the same cartridge though. Just is loaded to Nato specs.
Paul B.
[This message has been edited by Paul B. (edited March 01, 2000).]