Your making the assumption that my use of BT's is new. Its not. I have used them since the first hit the market in the green and red boxes. I have never had one not work, even the early versions, which were quit soft. The latest versions are very tough. In fact, IMO they are the toughest cup and core made.
I can tell you with certainty what happens with MI deer and a 300 mag or ultra with a 180 BT placed in the vitals. DRT. Of course a core loct, or a gameking would do they same as deer are very easy to kill and a BT is overkill for deer.
FWIW I have seen deer stop a 220gr coreloct out of a 30-06. Bone was never hot either and the deer died pretty quick. Did the bullet fail? Would it be more to your liking if the bullet had shot through and the deer ran 150 yards?
