If you're talking about a fair chase mountain lion hunt, good luck with that - carry the lightest weight rifle you can find, as I seriously doubt you'll see one. Now if you're using dogs, which most outfitters do - then the cat will be in a tree when you get there and a 22 lr will do the trick.
The 7X57 will be just fine - get a heavy jacketed bullet, as not to damage the hide. Good luck and enjoy the experience.
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