Modern CZs aren't as good as the Brnos that they are based on, particularly in the stock (and bedding) department. A few years ago the CZ550 magnums did not have cross bolts and the 458WM and 416Rigby were splitting stocks, so they started fitting cross bolts. They also recommend having the action bedded, as a precaution. I certainly found that my new CZ550 in 375H&H was making contact at the recoil lug under the rear sight base instead of the front action lug. I bedded it. I don't think 375s were splitting stocks but you can see the symtomatic problems with what's coming out of the CZ factory these days.

I still like the CZs since they are good value, but you need to spend some time or money addressing the bedding issues. I also have a CZ550 in 458, which has the notorious jamming problem (2nd last round in the magazine) as did many of the Brno 602s in this cartridge - but this is a different story. I still like the CZs anyway. I mean to buy a decent big bore new, or build one up, costs a few thousand dollars - the CZ550s are a bargain starting point.

In summary, get the cross bolts installed and get the bedding done.