I use my 338 edge and 300 mk for varmints and everything else I hunt. I believe in using the gun you use for long range hunting big game, for varmints also.
If you cant handle the recoil or cant see your impact at long range on a varmint, you have no business shooting at larger game at long range either!
Only 1 exception, and that is with a very experienced spotter in whom you trust. If you can't spot your own shots and you're not willing to hike a mile or 2 on the word of a hit or miss from your spotter, don't shoot.
Heed the man who owns only one gun, he likely knows how to use it.