My issue with the 5.56 is based on admittedly anecdotal evidence but evidence from sources I trust. The most telling is the stories from guys I knew in Afghanistan. Doing CQC in the caves they ran into numerous situations where they were putting two, three or more rounds in the boweling pin and not putting the bad guy down immediately. The guy was dead but he did not know it yet and often got several shot off before he died. As a a result of this, some of our guys were killed or wounded. I have heard similar stories from Iraq and the Philipines. Having said that, green tip was id'd as being a significant problem, which is why so many of us started loading LR which has somewhat better ballistic effect.

SFC W