308

[daduke]

There is more than just crimped in. The 7.62 has a stiffer primer body for rougher handling and some weapons that have floating firing pins, and the .308 has your standard large rifle primer. It's the same with .223 and 5.56, a primer for a ar with floating pin should be mil spec such as Remington #7 1/2 primers. That could be the issue with the M14 going auto with soft primer .308's in some rifles.