There are a lot of variables to this. I believe that genetics plays a big part in this. As do the species and subspecies. These are observations from two of the areas that I hunt. Wis. and Ill, 50 miles apart. Bucks only.

Wis. 1 1/2- 125 - 145 lbs. Ill. 1 1/2 - 130 - 150 lbs.
2 1/2- 145 - 165 lbs.2 1/2 - 150 - 170 lbs.
3 1/2 - 170- 190 lbs. 3 1/2 - 180 - 205 lbs.
4 1/2 - 180 - 200+ lbs. 4 1/2 - 190 - 225+ lbs.

For being only 50 miles apart, I don't know why the difference. The Ill. deer seem to have longer bodies.

In an area where I hunt up north in Wis., the land is very hilly and the deer are built differently. They have shorter bodies and barrel chests. They are built for hill climbing, unlike the steer like animals of Ill.

These are just my observations.