Not going to get into a long drawn out argument again, but the military didn’t pick the 223 for its man stopping power. The failures of the 223 in battle were the driving factor behind the development of 6.8 SPC.
Let's talk about the fact that they are using fmj bullets that dont expand, first. And then how they get full penetration on humans many times. Then we can discuss what totally different, expanding ammo can do on medium game with selected shot angles.The 223 as a military cartridge was for 2 reasons, and neither was killing power.
You could carry twice as much ammo as a 308.
Wounded soldiers cause far more chaos/mayhem on the battlefield than dead ones.