ATK came out to our range yesterday to do a ballistics demo. I got there at the very end and shot 64 gr Gold Dot .223 and 62 gr Federal TB LE223T3 .223 through my PDW, just to see what it would do.
GD .223
http://i108.photobucket.com/albums/n5/xpd54/photo2.jpg
Fed TB LE223T3
http://i108.photobucket.com/albums/n5/xpd54/photo.jpg
penny for comparison