I am going to rebarrel a gun that is currently a 7 Rem Mag. I was thinking of going with a 7 RUM but have heard that it is a barrel burner. I'd like to shoot the 180 Bergers over 3100 FPS so the RUM seems like the best choice. I just don't want the barrel to be shot out after 500 rounds. How fast can the 7 Rem Mag shoot the 180 Bergers? I am thinking 2950 would be about max.