[jonnyc]

The warnings and issues concerning ammo-use in M14s and M1As have nothing to do with the on-going myth about a difference between 7.62 and .308, the actual problem is the more sensitive primers that are often used with commercial ammo. Military primers are usually less sensitive and suffer fewer slam-fires in weapons that use inertial firing-pins than civilian/commercial primers. Not a big problem, but obviously something that Springfield was concerned about.