Interesting construction there, looking at the picture.
http://www.foxnews.com/scitech/2011/05/04/army-demonstrate-new-green-ammo-maryland/ (http://www.foxnews.com/scitech/2011/05/04/army-demonstrate-new-green-ammo-maryland/)
(http://a57.foxnews.com/static/managed/img/Scitech/397/224/army%20M855A1%20new%20ammo.jpg)
It's good to know that if you get shot with one of these you won't be getting lead poison . . . . #)
More info: http://www.military.com/news/article/May-2011/new-army-ammo-puts-mean-in-green.html?ESRC=army-a.nl (http://www.military.com/news/article/May-2011/new-army-ammo-puts-mean-in-green.html?ESRC=army-a.nl)
"Leveraging the science of 120mm tank rounds, Army engineers at Picatinny Arsenal, N.J. designed a 5.56mm rifle cartridge that incorporates a jacketed copper slug pushing a sharpened steel "penetrator." Testers showed during a May 4 demonstration here that the round can punch through quarter-inch steel armor out to 300 yards with ease."