knit picking are we?! LOL yes there's a little case pressure difference but that's like knit picking over 5.56x45 vs .223 lol about the same difference. (except the nato in that particular case is hotter rather than the commercial round)I'll give ya that .308/7.62x51 for letter "K" Mr Smith... although, from what little I understand, it's not quite right.
A .308 Winchester doesn't seem to be exactly the same as NATO 7.62x51...
7.62 NATO vs .308 Winchester Ammo, What's The Difference?