I wonder if there is also an issue between .308 and 7.62X51?
Although not identical, the 7.62×51mm NATO and the commercial .308 Winchester cartridges are similar enough that they can be loaded into rifles chambered for the other round, but the Winchester .308 cartridges are typically loaded to higher pressures than 7.62×51mm NATO cartridges.[citation needed] Even though the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) does not consider it unsafe to fire the commercial round in weapons chambered for the NATO round, there is significant discussion about compatible chamber and muzzle pressures between the two cartridges based on powder loads and wall thicknesses on the military vs. commercial rounds. While the debate goes both ways, the ATF recommends checking the stamping on the barrel; if one is unsure, one can consult the maker of the firearm.
That was a consideration when I purchased my M1A.
It will shoot whatever you feed it, with no danger.
I have read that there is.
Also a big issue with M1A rifles. They are timed for military ball ammo, you can blow one up with heavy (bullet weight) .308 rounds.
.308 is my choice over the nato. Just the opposite with the .223.
Significant differences. .308 Win has a tighter chamber than 7.62x51 NATO. The GO/NO-GO gauges are different for each chamber. I had a bad experience closing the bolt on a 7.62x51 NATO into a .308 Win chamber. Bang! Fortunately, the muzzle was pointed downrange and the bolt lugs locked sufficiently to restrain the brass. I've never used anything but .308 Win since and have had no problems. The box of 7.62x51 NATO remains in the safe and unused after 18 years.