Ive noticed 223 does a lot more damage than people think to steel. its the only thing that puts dents in my ar500. We tested a 1/2" ar500 plate at 100yds with a 223, 6.5 creed, 308, 7stw, and 300wm and the 223 with just 55gr fmj left a decent dent in it while even the 7stw with a 168gr doing...