Val Verde county is HUGE. Lots of varied areas, ranging from very good to very, very bad. Problem is that some of great areas look like some of the very bad areas. Generally, even in the good areas - you need a LOT of land to have good hunting because the deer density is so low. A 1000-1500 acres per person is not unheard of. Don't think you can get 200-300 acres per person and get decent hunting.
As I said, the county is big and varied - but deer density of 8-12 deer per thousand acres is pretty common. When you figure that includes all ages and sexes, you'll see what you're up against.
However, some areas have a lot - a whole lot - more deer.
I have learned that the three biggest lies I've heard down there are (and it's surprising how often you hear them):
(1) We saw over a hundred deer driving in the other night.
(2) There's no record of anthrax on the ranch
(3) Don't worry about not seeing deer. When it gets colder/rains/season starts, they'll come out of the woodwork.