I could never really find a straight answer online about the milsurp 7.62x51 stuff out of a .308. I found a lot of talk about "headspaces", and as I'm far from being a gunsmith, I didn't really follow the discussion. My understanding was that there are a few thousandths of an inch difference between the civilian and military versions in some dimensions, and that it probably wouldn't be a problem, but could be if you were on the outer edges of tolerance for your firearm and ammo at the same time.
I have a .308, have been shooting for just a few years, and find that it's still quite a bit more accurate than I am from field positions.
In the end, I'd agree with the above poster. Go to whatever is the most convenient ammo store for you (for me it's the Walmart across the street, although there's also a close Canadian Tire), and buy whichever caliber is better or more cheaply stocked.
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