Rosco,
You are better off learning and practicing "Failure Drills" than depending on Armor piercing rounds.
They were made for 9mm because of use in subguns.
KTW was a brand of armor piercing rounds, produced in the US until a law was passed banning so called "Cop-Killer bullets".
Whoever mentioned 7.62x25 was correct, that round is noted in its hotter forms to penetrate soft armor.
While possible the likelihood of most home invaders wearing body armor is small.
On the other hand it is very likely that home invaders will be armed...
Ammo designed to penetrate body armor as mentioned above would expend little energy into the target, passing through and becoming a down range hazard to others in your home.
Learn to shoot failure drills routinely, IMO.
Mike