I would agree with skeeter 7 mm. My father in law lives in texas (all his life). as far as getting a nice buck its as easy as ridding a bike. the deer on those ranches are raised like cattle. There really is NO SPORT in the hunt but you do end up with a nice deer. If its free go for it. Deer meat is deer meat no matter how you get it(legely of course). Good luck and have fun!!!