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The only difference between the two is the NATO chamber tolerances are just a fuzz more generous to make for greater reliability in a military weapon. The problem arises when firing brass-cased .308 Win in a NATO chamber. That extra room allows the brass to stretch more than a .308 chamber would. This can lead to case head seperations. You definitely shouldn't try to reload .308 brass that was fired in a NATO chamber.All that said, NATO ammo in a .308 chamber is fine.
Just for poops and giggles I'd keep the bullet weight under 168gr or less. 180 may stress the rear lockup on the enfield.