I view "top end" in relation to what I see on the properties I hunt either through scouting or trail cams or spotlighting. If I'm seeing a lot of scrappy 1.5 year olds and there are 2 or 3 2.5 and maybe a 3.5 year old those are my "top end" bucks. They stand out from the others. Now those deer may not qualify as the "top end" on another property, and may qualify as unheard of on yetanother. If it stands out from the "norm" on a property then to me it's top end for that property and thus a target.