I don't know much but I'm going to have to disagree with you on that EJR. With small rifle rounds, terminal ballistics is everything. Not penetrating deep enough will just cause a shallow bloody flesh wound, while penetrating too deep will pass through the other side leaving a tiny .22 sized hole. In the heat of close combat it is only the hits that count. You don't really think about where you are aiming, it is just a matter of center mass. Hunting is a different story.
We have these friendly discussions about ballistic theory now to maximise our potential for when we actually have to use it.
That's why you use Full Metal Jackets, or full metal jacketed hollow points, I'm sorry, but in combat, only an idiot if you use frangible ammo in your rifle out in the field. What's you're talking about DOES NOT happen with 5.56, 5.45, or any other small rifle round if you are using Full Metal Jacket or full metal jacketed hollow points. You don't know what you're talking about.
Plus if you hit someone with even a frangible rifle bullet in the brain, they are unconscious or dead. Taken out of the fight at least. I'm sorry, but you're wrong. Shot placement DOES matter a hell of a lot more than what FMJ rifle round you are using. Only an idiot if you bring frangible rounds onto a battlefield.
You're really going to sit there any deny that if you shoot someone in the brain with a metal rifle round that it will not take someone out of the fight?
I've talked to people that have actually been IN COMBAT while using the smaller 5.56 round, and they said that its all about SHOT placement, no matter what small rifle caliber you are using, whether it is 7.62 or 5.56. Proper Shot placement is what takes people out of the fight. Its also about MULTIPLE follow up shots, that hit their target, until the target is no longer moving, breathing, and they are obviously out of the fight and dying.
Hell, you can kill someone with a .22 rifle round if you put it in the right place. RFK was killed with .22's and hit men use it all the time. Put it right in their eye and brain, or their heart, and they're dead.
I don't think you know what you're talking about.
Not even to mention that fast, small projectiles going through heavy mass, create a huge temporary cavity inside the body that rips and destroys massive amounts of tissue causing nerves and blood vessels to break and bleed, and stop functioning. Those small fast projectiles also have LARGE exit wounds instead of small tiny exit wounds. If you're worried about all that, use jacketed hollow points. That should do the trick. Whatever you do, do not use frangible ammo in combat because of the penetrations problem. All copper and lead jacketed hollow points work just fine for penetration and damage.
Also, its a myth that people die when shot just once. So why in the world would you just shoot once? You continue shooting over and over and over again, until the target is down, not moving or breathing anymore. Only and idiot would stop shooting after you hit a target one time, even if its a head shot.
Also, you can TRAIN yourself to aim for Hips and Heads, even under stressful conditions. Only the untrained go for centermass ONLY hits as a reaction or reflect when shooting. You can actually train yourself to put two in the chest and then one in the head, and then focus on the head and hips, in case they are wearing plate armor in a bullet proof vest. You continue to shoot until the target is down and is not breathing or moving anymore. I'd say you should empty your magazine, then I'd probably do a reload, and if it moved again, I'd keep shooting until it stops moving and breathing.
These are things that everyone here should know.