I slid a .375cal 250gr ttsx through a couple of moose ribs at about 40 yards today with no sign of petal breakage. I did find a partial petal from a 7mm 140gr ttsx in the exit wound of a caribou this year; it was shot at about 430 yards. That bullet hit the humerus on the far side before exiting. I've been very happy with the ttsx so far.

If you are going to be dumb - you've got to be tuff.