Re: CZ550 CRF for hunting?
It is a fine choice. Mauser lineage, controlled round feed, integral ring mounts, set trigger, well machined and nicely finished. I say go for it.
I own three factory CZ'z and they all drive tacks. My only complaint is the short stock on the 527.
Or you can always go pick up a 98 Mauser that has been sporterized and use it as a starting point. Generally they are not that expensive and if you keep an eye out you can find one that has had all of the good stuff done to it. Like the bent bolt handle, trigger upgrade, hinged floor plate with push button release, drilled and tapped for mounts, etc...
Good luck with your build.