I found this article on the web. I personally would not sight in my Marlin to be a 200 yard gun like this article mentions, but it is interesting anyway.
I know my shots are going to be a lot closer than even 125 yards (last years two were under 20 yards), and I like my gun sighted in so I hit the hair I am aiming at on the side of the deer.

http://www.chuckhawks.com/30-30Win.htm

C. Davis