I haven't shot the Dead Centers, but I've been shooting the QT .40's for a while and I've found them to be exceptionally good bullets. Pretty much any bullet Precision Rifle makes is going to be top notch quality.

I have no experience with the "duplex sabot" concept. I think that it might be going a bit overboard on the whole long-range high-velocity muzzleloading craze, but I also think everyone ought to be able to use what they want, as long as it's suitable for the task.

The Dead Center bullets have a smooth ogive and are designed for more controlled expansion and greater penetration, so that they'll shoot through the animal (2 holes=bigger blood trail). The QT's have a semi-wadcutter like step and flat bearing surface, so they aren't quite as aerodynamic as the dead centers. The QT's are also designed for rapid expansion and energy transfer and don't always pass through a deer. They do make a deer's innards look like they were run through a blender though, massive chest trauma is an understatement.

Mike