Hi HE, I've owned and used a few 7rm's over the yrs, and it is a very versatile and powerful cartridge.For larger deer at long range, its an excellent choice.It's a popular choice here as an all-rounder for everything from deer to moose and everything in between. I.ve seen a number of one shot clean kills on all of the above, including a few of my own.
My only concern for you , after looking at the calibers you currently use, is that the 7mm does have more recoil than either of them.I dont think that they kick to hard, especially in a properly fitted rifle, but recoil is a bit of a subjective thing. What bothers some isn't an issue for others.
I'm not trying to put you off in any way, but it is something to keep in mind.To be honest if I were limited to one caliber,I'd happily carry one here and would be ready for anything that walks in this part of the world.Like any cartridge that pushes the 3000 fps mark, you should use a good bullet that wont come apart on the close shots or lack penetration on larger game. I've used 175 gr nosler partitions on moose and had complete penetration( through & through) For general use I'd stick with a good 160 gr bullet and leave it at that.
All in all , if you do end up buying one, I know you wont be disappointed.
Good hunting AB