never used bergers, from what I heard it is a great paper puncher, I would not use them in a match and for sure not on rams, they might do the trick on other animals, I used sierras 142s and after loosing 3 rams in one run (got only 6/10) ( this was at a Nationals and it could be a deciding score) I quit using this silhouette useless type of the bullet, it probably cost me the championships!, I went to the Lapua 139 gr! and never looked back at sierra!
I am shooting 108 and 139 gr Lapuas with a great success.