It shouldn't change that much past 200.. That is weird. I would call Remington. They might want to look at it. I don't have pictures of my groups from my .308. But it is still sub MOA at 600 yards. That is as far as I have shot it.
" The strongest reason for the people to retain the right to
keep and bear arms is, as a last resort, to protect
themselves against tyranny in Government...." - Thomas Jefferson