Well, all I can say is that I have never had an animal run off using Berger Bullets. Myself and my clients have killed several big bull moose, bull caribou, wolves, mountain goats and 2 grizzlies. All are dead!.. All never went any further than 50 yards. On the moose I killed, one of the rounds hit him in the front shoulder and traveled about 5 feet before exiting with a massive exit wound. On the pic I up loaded you can see the exit would and blood if you look closely. As for the bear and the bullets not exiting, grizzlies are dense. The rounds still traveled 2-3 feet on both shots. On other moose I have seen no pass trough's. When opened up the moose farside rib cage looked like a shot gun hit him. That moose only took 1 round at 100 yards. All things have the potential to fail. But bottom line, my experience with the Berger bullets has been great.
As for telephone books, that's not a great media to use compared to ballistic gel with real bone. I think if you want to talk about real world experiences use real world material. Use ballistic gel with real bone that represents the animal not telephone books.
In the last 5 years I have killed or watched over 15 big game animals go down using bergers. They all go down, they are all recovered animals bottom line.
Here is a another pic I just got back from the guide!!