Cripes ... at one time I owned a Zastava in 458WinMag with Butler Ck stock. It was fine other than an issue feeding the 510gr Winchester soft with its big lead nose. Was fine with a Woodleigh though. Sold it and later bought a CZ550 in 458WinMag. Guess what ... it also didn't feed and was about 1kg heavier.

There was a a question mark regarding the Zastava rifles in 375H&H as metal was removed from the feed ramp to open the action (possibly weakening it) and I've read that the high level of polish is a nightmare for a custom gunsmith to re-do if the receiver needs a touch up polish for a full blown custom.

As a user rifle ... they're fine. Phil Shoemaker from memory runs an InterArms 458WM as his guiding rifle for Brown bears.

For sure the Zastava will need clean up work just like any other rifle, but the action is inherently suitable for 'user rifle' purposes.
Cheers...
Con