This is all very interesting. I've come to the conclusion reading this that even the biggest proponents of using Bergers on Elk don't recommend them if the shot angle is less than ideal or heavy bone may be encountered (doubly interesting that many of these same individuals slap themselves on the back for shooting an Elk at 800 yds). I'm sorry, but I just don't have any patience for stuff like that in the name of high BC "target" bullets. Pass the Barnes LRX please. They shoot more accurately anyway.
I have no experience with bergers on elk. I've used the 70 vld in a .223 on coyotes and they don't exit usually. I've also had thicker jacketed hunting bullets detonate at .308 win. velocities on elk.
