That data is based on computer simulations and projections, not combat or even shooting living targets. The army is big on computer simulations to push projects - that's the 9mm Luger ended up being "far more lethal than the .45".
Sure.
You can't argue with 4.5 inches of cavitation in ballistic gelatin...for 14inches.
The the penetration qualities against steel plate and concrete.
I spoke to a man yesterday whos' son is a Ranger in Afghanistan.
The boy swears the one shot kills are GRUESOME.
It's the only ball ammo he's ever known, and the M4 is the only "rifle" he's ever known.
He simply loves it.