I also have 7rm it's heavy and as posted this is a skinny barrel build need to pack it all day in excess of 10mi at times. The load data I've been looking at has velocity diff with 160gr at 200+fps with the possibility of a long shot that will help. Nosler has 280ai brass I think they standardized the cartridge beside, can fire form with 280 brass no hassle. My 300wm is light but I don't enjoy shooting it, hard for me to be confident with it. Another good reason to fill up a spot in the safe so to speak.