Well I shot a big black bear with CE .375 Cal 330 gr - 50 MTH in 375 H&H on 200 yards. First bullet went through his shoulder blade and exited behind shoulder on the other side. Pencil hole, no expansion.
Bear started running and after about 100 yards, when he showed no signs of slowing down, I shot him again with 300 gr Barnes TSX. He wend down immediately.
I found the mushroomed bullet inside weighting 280 grains.
So you can say I have bad experience with CE bullets expansion.
Well, main thing is, the bear is in my freezer.
Here is the picture
Black Bear Hunting with Crossbow