Me and my buddies shot the 165 Matrix this year and took a pile of elk and deer with them, there is no bullet that will put the smack down on elk like them!!! My buddies shoot 270 Wins and after the first elk with the 165 all of them wanted them loaded and they shot up their 130 and 140 gr bullet so we had more brass to load 165's. We're running the 165 in the 2750-2850 fps range in the 270 wins, elk shots were from 85 yards to a couple hundred with the 270 win and I took a bull at 865 with my 270 WSM.
We've taken elk with 130 gr bullets out to 500 yards but you have to be spot on, with the 165 gr bullets your in a different class and can take a shot with very high level of confidence!!!
At 6000ft elevation I'm very comfortable shooting a bull at 800yrds with the 270 win and 165 Matrix, and the WSM adds 200 yards to that.
Deer don't like the 165's at all but it is over kill and we do load 140 Bergers for those or for reduced recoil for the wives