Hey Fear!

4" at 200 sounds reasonable (2 MOA) but that's a long way from 4" at 600 (.66 MOA).
A 1" group @ 100 yards = 1 MOA, 2" @200 = 1MOA,,, 10" @ 1000 yards equals 1 minute of angle (MOA). Ten shot <1 MOA happens at 1000 yards but not with any off the shelf rifles that I'm aware of.
Edited to add: Wow. It only took me two and a half years to make Journeyman! lol