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Adam, it isnt a problem shooting 7.62 Nato out of a .308win, as a matter of fact most 7.62nato would considered a "mild" .308loading.
it's when you reverse it and fire .308's out of a 7.62nato specced weapon. The softer brass added to the higher pressures can (from personal experience) cause cases to formfit to fluted chambers, ripping off heads as the bolt tries to extract the case.
Yes this is the CETME example again, but it is one i have personal experience with. Look at the older FAL's prior to the adjustable gas ports for them, they had quite a rep for chewing up .308brass, adn head seperations as well, but they function fine with NATO specced 7.62
on average the .308win case will hold 2 to 3 grains (depending on manufacturer) more than a 7.62nato.
If we look at the .308win loading charts for , lets says the 168gr BTSP, a fairly popular loading i am sure you will agree.
The min to max loading is only 5 grains difference, now if your cases vary by 3 grains (maximum example) how dangerous is that?
even if we focus on the 2 grains difference that _can_ still be a considerable increase in pressure.
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