I've personally seen .45 acp do different things.
One .45 hit the dirt/rock at 45 degrees or so, behind a man, the bullet hit him below the left ear, traveled around the skull, under his scalp, and exited out, just above his right eye.
In the hospital for a week or so, then returned back to duty.
Left a cool, purple mark around his head with a black eye. ( He was not issued a Purple Heart, due to accidental friendly fire !)
The second .45 acp was being fanned like a cowboy gun (twirlling) on his trigger finger. When he stopped twirlling, he hit the back strap as the muzzle was about even with his mouth ...BAM, bullet went thru his mouth, up towards the back of his head ..
that exit wound was nasty, took most of his head off.
Who knows how a round will react !
Mac

.45 >>>>> @@
Retired US Army.
EDC: Sig Sauer 1911 UC .45 acp