So I'm pretty well versed on the 5.56 NATO ammunition I've been using in my M4 and I'm curious about the .223 cartridge. It's been a turn off for me for some time now just out of pure ignorance on the actual thing. I guess because it sounds like a 22, or 22LR. What is the .223 all about? Does it bounce around, is it accurate, expensive, etc? What can I learn about this round? I'm shipping out in October and more than likely will be using the M4 for my duties and I know the 5.56 NATO round is standard issue, but is the .223 used at all for the military? Thanks!