[Hazcat]

GK,

Yes the .308 and the 762 are the same and yet not. The NATO round has thicker brass and the Military rifle has a deeper head space (this I got from an ammo MFG and reading on the WEB). You can fire both from either BUT the civilian .308 may over expand and jam in the military rifle.

[GingisK]

Military rifle has a deeper head space

When measured to .001, I find both exactly the same length. They mass the same on my tripple-beam Ohaus.

[GingisK]

Belay that mass statement! Mr. Ohaus indicates that the military stuff is a bit heavier, especially when I clean both samples out well.

The external size of the cartridges are the same, however. The following is a good reference: http://www.smellysmleshooters.net/ammopressure.htm