IMO, if you don't have a sub MOA gun to begin with, you may be looking at random variations more than solid data.
My 6.5-284 Krieger/M-70 is half MOA (or less) and I did my testing at 400, not 200 yds. Even at that distance, it was sometimes hard to tell where the bullets were landing, because they were hitting so close. Required a few 4 wheeler trips to sort it out. And, I have a great spotting scope.
DF
