I'm not too much of a gun person, but all the guys behind the counter recommended this rifle for what I'm wanting to do. What would you guys recommend?

Currently I have a .22 and a .243, and what I'm looking for is a single gun that will not blow apart a fox, but at the same time be able to knock down a wolf from a couple hundred yards. Should I just move to a full metal jacket round in the .243 and call it good?