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Agreed there is a considerable difference in 7.62x51 nato and .308 winchester.
7.62 nato uses a thicker, harder brass, at a slightly reduced pressure level. This is to be expected for a military round, as we all know battlefield conditions are rife with any numbers of factors that can raise pressure levels (trash, grit, mud, massive changes in humidity and temp) as well as ammo care once loaded into magazines.
.308winchester in general uses a softer brass that is not quite as thick, as well as some loading being well above NATO standard pressures. (interestingly enough this is one of the major causes of stuck cases, ripped heads in CETME's)
Most bolt actions chambered for either cartridge, _IF_ in good working condition, can fire either with no problems, within reason.
Semi-autos can be abit picky about the pressue levels though, especially if they were specfically designed to work at NATO standard pressure levels.
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