I will have to look up my load for the 120. I woulld think that the 120 Sierra would be a little fragil for the 7 Mag. Can't say about the 120 Hornady. I only load the 120 for the 280 to a little under 2900 fps. It performs well at that Velocity. It does not need to much velocity to expand well. I am going to try it in the 7MM-08 this fall as well. I keep all my deer loads to well under 3000 fps. 2700- 2850 is about my prefered velocity.