Interestingly my experience with the new long range accubond has been close to the same as a Berger. These type of bullets are designed to still expand (or fragment) at lower velocities. It's either full weight retention or fragmentation it seems, although I can't say I'm unhappy with the performance of the LR accubonds so far.
This is from the opposite shoulder of a bear, burried in its hide after it busted both shoulders. What used to be a 190 grain bullet fired from 300 yards.

I'm more of a weight retention guy, usually prefer accubond type performance. I know this thread is about Bergers but I think this goes along with the subject of fragmenting bullets.