gunrac- the 10mm 200 XTP has been my deer hunting bullet for 3 years now. For me it is almost (although not quite) as accurate as the 200 SST. On a good day, I'll shoot 1.5" groups at 100 yards with the XTP. That's almost as good as I can shoot, as my best groups with the SST were 1.25".
It's probably not the "best" all-around bullet out there, but I would say that it is one of the best, especially for the price if you buy them in bulk. I also think that it is a great performer on deer-sized game. I've taken 3 deer with them- 3 shots, 3 kills. I shoot them out of a .45, so I use the Harvestor light blue sabots. Here's some pics of a group at the range and one XTP I recovered from the buck I shot last year: