I have two hunting pals who, for at least 20 years, used nothing but their 7mm RM for everything. One uses a Ruger 77 with 24 inch barrel, and the other uses a Ruger No. 1B with 26-inch barrel. The Ruger M77 has been all over the world and shot all sorts of game from giant ones, deer, elk, moose, bears, boar - all dead with one shot of 175-gr bullets. The 1B has mostly been a stand rifle, over grain and bean fields, using 160-gr Sierra GK. That owner has now gone to a Kimber 7mm-08 as his stalking rifle for wooded hills.
I shoot 7x57, 7mm-08, 7x64 and .280 Rem, but no 7mm magnums. I love the 7s, and there are some great bullets for them, but as said, other than some niche rifle for specialized hunting, there is nothing the 7mm RM will do that a .30-06 with the same barrel, scope and bullet style will not do, as far as anyone can ethically take game.
But it is a very versatile cartridge, and comes ( came ) in some beautiful rifles: Ruger M77, Winchester Super Grade, Sako Finnbear, Steyr Model S, Browning 1885.
Go for one of those with a 24-inch barrel ( or 26 or 28 for single shot ), and enjoy forever.