Buddy of mine shot a nice 8 point at a little over 100 yards with a 7mm-08 "American Whitetail" load. I am pretty sure it was a 140 grain bullet. He shot the deer through the shoulders. When I was helping him load the deer up I noticed a bulge under the hide and I asked him if I could cut out the bullet so we could look at it. My request sort of amused him as he is an older guy and not a rifle/bullet nut.
Anyway the bullet had pretty well disintegrated....a pretty good sized chunk was left along with a lot of frags. Based on their reputation I figured the bullet would have held together a little better, but sometimes cup and cores do that. Based on that sample of one I can't say that they are any better, or worse, than a core-lokt or power-point.
The deer dropped in its tracks and my buddy had no complaints!
