I'm a fan of accuracy, speed, and penetration. This is my reason for going with a 155gr XTP handloaded in a 40S&W. The 155XTP has good velocity (1150-1200fps depending on load), it expands (not as much as some), and you get stellar penetration. I'm also getting more consistent, and excellent accuracy from my handloaded 155XTP's @ 1150fps (haven't tried higher velocity YET) than any other store bought whiz bang round that you can get at your LGS. TnOutDoors has tested the XTP bullet in GEL using the Hornady TAP load, and it performed impressively based on the criteria I look for in a handgun cartridge.