I was already a member of this forum when I started looking for a 375H&H. My choice came down to a CZ550 (new) or look around for a ZKK602.
Based on a lot of research mostly on this site I eventually found my first ZKK in 375H&H. I now have 6 ZKKs ranging from 7x57 up to 416Rigby.

No issues with any of them. Most people I spoke to simply said that they thought the ZKKs were better. Has worked well for me.
Does not help the OP however just my experiences.

Rick