I have a M70 in 300 WM. I highly recommend the cartridge as long as you know what you are getting into. It is by no means over kill for white tails or mulies. I have taken many whitetails, prairie dogs, pigs and even a buffalo with it.
It does have significant felt recoil and if you are sensitive to it, don't buy one.
It gives you the versatility to hunt nearly everything in North America with one gun.
Sounds like you want a new toy, been there more times than I would admit to my wife!