I'm converting my G23 to a 9mm for a carry piece. My biggest concern with the 9mm is over penetration. I know with 339 ft lbs muzzle torque that it has the stopping power. I don't want to risk endangering friendlies by blasting thru an attacker or thru a wall. I'm considering loading 124 gr Hornady TAP cartrages. Has anyone done any testing on 9mm ammo? Ballistics numbers don't tell the whole story. I would appreciate some good recommendations.