The muzzle energy of a round is the best indicator of its ability to destroy tissue. A .223 Remington 60 grain hollow point has a muzzle energy of 1350 ft-pounds,,,,,,a standard 130 grain 30-30 round used deer hunting nationwide develops 1600 ft-pounds of energy. The .300 Weatherby Super Mag I Elk hunt with develops 4100 ft-pounds of Energy .
You didn’t even know an M16/AR15 fires a .22 caliber bullet. Educate yourself on the subject a bit and don’t just soak in the crap people spew out trying to push their own agenda.
Like I said the military is replacing the .223 with the new 6.5mm NATO round because of the .223’s lack of killing ability. It is not some super killing bullet