Awwh the Oct Lull? Does it, or does it not exist.. big question..
But in my mind and I will back that up with additional information... Yes, it does exist..
My personal, in field experience tells me that "Big" aka "Mature" (3 1/2 or Older) buck moment is greatly reduced.. Not so much in early Oct or in late Oct,, but the mid two weeks plus or minus a week for regional and seasonal difference. The mature bucks are in a transition period between bachelor groups and rut, and just plain and simple move less and are becoming more nocturnal in their travels.. Pressure may accent that, or complete lack of pressure as in a controlled preserve may minimize it, but it happens regardless.
Additional information is easily observed by watching the various web sights and the hero pictures..or checking the records lists, very few if any will be posted in those mid Oct weeks.
Normally there are some great bucks that go down early season because of them being on the tail end of a summer feeding pattern, and some astute or lucky hunter being able to capitalize on it..
Then comes late Oct, or Earl E. November and you will start to see some rutting bucks go down.
I also have come to believe the weather patterns enhance it.. Typically that period if free from frontal systems going through, having winds best described as "Light and veriable"..
What does that have to do with anything?? It makes normal hunting methods of setting in a stand going between bed and breakfast,pretty useless. Especially if you are hunting that 1-2% of the heard, animal, he will detect you well ahead of time and simply avoid the encounter..
Is that period hunt-able?? You bet, but I really believe you need to hunt "known" big buck bedding areas.. Plan on being there "Well" before first light, and hope for a mid to late morning encounter as he chooses to stretch his legs a bit and possibly raid the pantry before he settles back down..You also need a plan for getting out of there which does not include busting him or stinking the place up. That is unless you don't plan on hunting it again.
Additionally I believe big bucks become members of bachelor groups for two reasons.. One to avoid the disturbance and activity of the doe fawn groups. Two to be able to use lesser bucks as their scouts so to speak, and have them run interference on their travels.
As their testosterones increase and they tend to run off the younger bucks, they find themselves alone and free of their scouts.. Hence they are more cautious, moving slowly to read these light and variable winds or just plane and simple moving under the cover of darkness