If one drop of the charge handle is enough to force the .350 case into a .308 neck it will fire, rupture the case and blow the mag apart at a minimum, it could blow the carrier and upper receiver apart. I know of someone that did just that except he dropped the charge handle 3 times to force the 5.56 case into the neck area of the 6.8. It blew the mag bottom off but did not break the bolt, carrier or receiver, it just scared the crap out of him. The same thing could happen with a 5.56 in a 7.62x39.
Last edited by Constructor; 07-23-2010 at 10:57..