Here is Barnes load data from there web site you have to go to the 140 gr bullet in their data to reach 3100fps in the 7mm rem mag. Barnes is one of the more accurate load data providers.
Says "who"?
Quit reading....start loading and shooting...
..I have never owned a 7RM (out of many)that would not give 3050-3080 with a 160;and if you set the rifle up properly you will, indeed, get 3100 from it very easily and safely.
If you want a 160 at 2850, buy a 280....
Dober is, as usual, correct.