How about the Mississippi woman who was shot thru the brain with a 380 (thru & thru), survived, and then made tea for the investigating officer.
If the same shot had been made with a 9mm para bullet, which is heavier and travels significantly faster, it is likely that the victim would be immediately (and permanently) stopped.
The bullet went thru her brain in a very lucky path that did not hit the lobes. the 9mm is the same dia. as the 380 and would have had the exact same outcome. It being faster and heavier would not have made a difference. the dia. is what mattered in that shot.