I can only say for the fact of owning them and not for Africa use yet. I had a CZ in 416 Rigby that I sold to my dad who used it in AK on a Brown bear hunt with no issues. I own a 458 Lott in a CZ and I have had no issues with it either. I shoot it a fair amount in ND cold which is below zero a lot during winter and in the low hundreds in the summer. I feel they are good guns with just a little care. The one thing I noted with both was they can be a tad heavy for long hikes. I like that for the reason that I am not a large person and it helps in recoil from both calibers.