Those faults can arise on any gun, they aren’t exclusive to 700’s, that’s for certain. I mentioned earlier the hook design on the 4 & 700’s being a weak point of the gun. They’re smaller than normal and tend to wear in rather quickly, especially with heavy use. I’ve seen many many 400’s with dovetailed and welded up hooks, and a few 700’s with the same treatment. Don’t see too many dovetailed 700’s, that method being somewhat obsolete with the advent of spray welding, tig and laser.
1 very nice 400 I owned had a dovetailed hook. 2 other of my 400’s sported welded hooks. My lone 700 actioned gun has a tig welded hook (JJ Perodeau) and after a few thousand rounds it is still tight and on the face.