Those Xtreme Penetrators are somebody's idea of cool. They don't make the bullet penetrate any more than a regular jacket. The progressive nose geometry stuff is marketing BS. And cast lead bullets break up upon impact.
"...Bears are big & mean..." You really need to learn more about bears. Yogi is usually neither unless he/she is a griz or brownie. The average adult male black bear weighs about 300 pounds. If his diet is good. And they're smaller in Georgia.
A huge black bear weighs about 300 Kilos(660 pounds). The world record was a road kill weighing 700- 800 pounds. And he's rarely mean unless you PO him. In which case, you will never be able to recognize what you've done, draw, aim and fire accurately enough with any hand gun for it to help you. Yogi can run at 35 MPH. That's 100 yards in less than 6 seconds.
And no a 9mm isn't enough. The heaviest bullet is a 147. A Hornady XTP has 310 ft-lbs of energy AT THE MUZZLE. Mind you, if you didn't PO him, the sound of the shot might scare him off.