Huntingbry, i think i read that exact article. I think it was saying that once they reach that age, they know the deal and become more concerned with survival instead of breeding and fighting.

As for impossible to kill bucks. I dont think that there is any deer that is impossible to kill, although some seem it. I read in one magazine one time, think about how many trees a deer walks by in a day- Thousands. You could have a tree stand in any one of them. A deer has to move atleast alittle bit dureing daylight hours. I might be mistaken, but i have heard they have to eat every 4-5 hours, not necessarily a ton, but they will browse alittle, there has to be atleast a slim shot at getting every buck.
So in closing, i guess there is no impossible bucks to kill, just the ones im after![:@]