I owned a high fenced farm a few years ago with my hunting partner as a hobby to see how big whitetails could get if allowed to mature. While it was fun, it was a lot harder than you think. I can promise you with zero reservation, deer inside a fence are five times harder to kill than in the wild. The shows you see with all of the big deer being taken are pen raised and released. But if you high fence an area and just let them get old, you better bring your lunch. Again, it is fun, but you are doing most of your hunting with trail cams and finding sheds. It is not what you think.