Years ago most of the real large bucks were shot during late seasons that ran into December. There was a service station in Cove Fort Utah where I-70 and I-15 now meet, in that station they had some of the largest bucks that I have ever seen, they all were shot legally in December. Same with a station in Loa, Utah which had a few large bucks that were shot once the deer came down to the hay fields.
Today a person can still find those kind of deer but he is going to have to work for them.