For the last 3 years my friend has shot his Elk and killed it each time with a 168 gr berger. Each time he tells me that the bullets had passed all the way through with no expansion and he had to track the Elk down. This year he had thought he missed because he watched the dust fly up from behind the elk, the elk took off and then about 200 yds away it collapsed. Upon seeing the Elk he realized that he did hit the Elk and the bullet had passed all the way through just as it had the other years, with no expansion. He doesn't load his own bullets, another guy does it for him. I've never had any problems like this. I use Berger bullets in 4 different rounds, they have always been perfect. Any ideas as to what is going on? Is this a common issue with Bergers?