I've used both the 180 30 cals - the very first BTs I could buy, when they came in only three colors- on moose with complete pass through results, and also the 200 BTs in the 340 when they still came in 100 count boxes. The 340 has always kept them in the moose I've shot, but the bullets have remained intact almost every time. The only downside to using BTs has been the result when hunting animals that might be killed on the move (when shots end up being elsewhere than desired, usually behind of where.) They can be messy, if effective. But that is exactly the same issue I have with Interlocks and Pro-Hunters. Wolves are so solid that the BT can be nice in that they kill very well without leaving a big messy exit as some of the bullets with greater integrity tend to do.
I like expanding bullets to expand, but I agree that the resulting bullets recovered are only a part of the story, and usually they at least suggest that something big was hit, moved, and/or destroyed in the process.
Sometimes, the air you 'let in'matters less than the air you 'let out'.
