I sold several of the CZ's in the 458 lott caliber as did a few of my buddy's with gun shops.
and been our experience, on models made before say 2008 or so, that a LOT of the stock would creak break, I believe they change stock design or support like of it, to stop the cracking from happening, but a heads up to anyone that finds older used one!

and NO CZ doesbn't stand by them and replace them free of charge its all out of pocket costs when they break!
other wise very solid guns!

as for what gun/caliber to be having for back up
well since I have ZERO desire to shoot or kill anything on any safari , I doubt I would ever need to find out
but IF I did go, it would be rather simple, it would;be the largest caliber rifle I could shoot fast and accurately!
as don't care how large a caliber is, if you DON"T get it up and ready and HIT what you need to, its not going to do you any good!

It would also again, be a caliber I could afford to shot often and practice a lot with before hand, as again, having a BIG exotic caliber rifle you cannot afford to practice with, tends to mean one you shoot poorly!