Posted by Billy NY on March 22, 2012 at 07:38:16 from (67.248.100.3):
In Reply to: OT/gun question posted by mb58 on March 22, 2012 at 07:24:52:
None, 'cept units of measure, 5.56 mm is military, in metric, .223 is the equivalent in SAE or ASME or what reference standard applies and I assume has a nato designation, like the 7.62 x 51 which is a .308
With the 7.62, there are differences in case thickness, between reference standards if you really want to get into that, so a .308 round manufactured for civilian use vs 7.62 mfr'd for military use appears different, I've noticed when reloading cases, mil. cases seem to have less room. No gunsmith or expert on this, just from reading and some reloading.
5.56mm = .223, and say you have a ruger mini 14 or ranch rifle like mine, military 5.56mm chambers correctly and fires safely.
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