Mall Ninja ammo. I wouldn't trust my life to ANY prefragmented round. If you look at what creates failures to stop, you'll see that they all have one thing in common. No matter how much "energy" the perpetrator got hit with. Whether due to poor marksmanship or lack of penetration, none of the rounds took out anything immediately vital. Prefragmented rounds don't have the penetration to reliably take out vital organs under many conditions. I want something that will get into the boiler room and shut off the steam, even if it has to go through an arm or something on the way in.