Weapons to targets
As to which rounds would penetrate a person in Level III or lower body armor? Heh. We all saw that armored bank robber get back up after being knocked down by a conventional round. But knocking someone down means you can then kick his liver, stomp on his kidneys, chop his knards. He's not getting up. G. Gordon Liddy, when rogue cops were a worry, said always aim for the head of the SWAT team breaks into your house. Same thing goes for if a crazy person breaks into your school, the modern threat.
I will stick with my .357 Magnum; the experts I've talked to say "Yes, no, maybe" as to its effectiveness against conventional body armor, and yes, I will aim high.
Accuracy is always important.