The fact is that the .223 cartridge is the LOWEST power centerfire round on the market. The lowest. Not one of the lowest. Not the third lowest. THE lowest. A .308 packs about 2 times the ballistic energy.
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It still can kill at twice the impact of a 357 magnum. The hole will just be a little smaller. You don't hear anyone say, "Just so you know, the AK 7.62x39 is really not very powerful." This is the kind of thing nimrods debate on the internet.
I have been shot with an AK. The round penetrated a car door, went thru my calf and out the other door. I'll bet a 223 Rem or its NATO equivalent hurts just as much, but after passing thru one's pink squishy insides it might not go thru the opposite door on the vehicle you are sitting in!
It makes me chuckle when people debate the caliber decisions for light arms made by literally every military organization in the modern world. I guess the fat, zit face kid sitting in the darkness of his mothers basement knows more about combat and killing enemies more efficiently than the DoD, Pentagon, The UK Strategic Command, NATO, the former Soviet Union or today's Russia, et al.
Right gun and caliber for the right job. For the longest time, Mossad assassins carried 22LR Berettas, often used with shorty suppressor. The Mob famously used 22's to whack people... two shots behind the ear was the protocol. Reason being, the 22LR tends to bounce around inside the skull turning the brain to Jello vs. going clean thru. The lowly 22LR can easily kill a human or anything else with a pulse at a fraction of the ballistic performance of an AR round.
It's true the AR round was not designed for hunting big game and some states prohibited use of the AR for hunting. There are many other restrictions on guns and ammo types used for hunting, enforced at the state level. The AR was made for soldiers to kill enemy combatants at close range, not a 1000 lb bull elk at 500 yards.
Sampson killed 10,000 Philistines with the jawbone of an ass. Caliber debates on the interwebs are often fought with the same weapon.