The .300 Win Mag is probably my favorite all-around rifle cartridge. I find it to be very tolerable with 180 grainers and below. When you step up to the 200 grain plus pills and drive them at average to high velocities, the recoil becomes a lot more stout. To me, every larger caliber has that bullet weight where you really notice a change in recoil.
Also, for what it is worth, I have a Tikka M695 .300 Win Mag that shoots 150 grain bullets lights out. I use it for deer hunting here in Wisconsin. I also tested out 125 grain Speer TNT's in it for the heck of it. I got GREAT results! I am going to work up a load with 125 grain Nosler Ballistic Tips for deer hunting before next season.
Bottom line, have fun with your new rifle in a great caliber!
Jon