Not an expert but I think that with a higher buck to doe ratio, the bucks will fight more over the territory that the does occupy.
I have a picture of a buck next to a yearling and I estimate his live weight to be over 300#. I shot a buck in a reduction zone this year that field dressed #195 and the other buck looks to be a whole lot bigger. He's (I am estimating) a 5 1/2 year old. No pics of him in the daylight. Neck starts at the bottom of his chest. I think I have a pic on the computer, if I do I'll post it.