Just my opinion but I think a lot of these bucks move about during the middle of the day alot and at the fringes of daylight. The rut does bring the big boys out in an all day fashion but in the pre and post rut periods, I have seen mature bucks countless times out and about near high noon. I think if you find a big bucks core area and sit on stand from mid morning (8:30-9:00am) until dusk, you have a much better shot at killing him rather than slipping in at noon or later when he may be up moving drinking and browsing. I have several stands set up for only this type of hunting.