I have never had a berger failure and shot a pile of game with them, from a 25-06 up to 338RUM
Everything died.
Distances from 50yards to 450yards, good and bad angles.
I have however had failures to expand on swift sirocco11 in my 257bee, ttsx in my 280ai.
Maybe it is just me, but stuff I have shot with Berger bullets has died, with more or less the same damage as any other bullet I have shot, the only difference was that the game went down like a freight train hit them.
That's what I like about them, they kill stuff. I have chased game all over hell's half acre with other bullets, and never tracked one with Bergers.
Not saying that they are the best but I have yet to have one fail.
Over 50 animals and counting.