I have taken mature bucks in S.E. Wisc that range from 160 dressed all the way to over 300 pounds dressed. My highest scoreing buck was a 6 year old that scored in the 180's, but only weighed 170 dressed. The heaviest bottomed out my 300 pound scale dressed, before we had it completely off of the ground. It was also a 6 year old. We can only guese at what his real weight was, but live weight had to be near 400. here is a photo of that buck.
http://bloodbro.com/trophyroom/pages/image1.htm

Here is the 170 pound buck,
http://bloodbro.com/trophyroom/pages/image2.htm