the hit a deer can take and remain mobile. I once shot a deer w/ a 30-06 head on, dead center chest at @ 70 yds. I saw the deer pushed backward by the force; it then ran 90 yds across a field before collapsing. The interesting thing was that at least 1/3 of it's heart was simply gone.
BTW, that is a shot I'll never take again as the internals were turned to soup by bullet fragmentation-what a mess.
Myself, I keep my eye on the hit deer for as long as possible as well as listening carefully once I lose sight. If in doubt of shot placement I check the arrow as soon as the deer is gone, climbing down slowly. Usually I wait 30 min or so before tracking but if I'm losing light or it's raining/snowing maybe 10 min. Beyond sight and sound, using your sniffer can be invaluable as well when on a blood trail -particularly if the rut is on!

Here we have the opposite problem w/ space; many properties are not all that large and EVERYTHING adjacent is posted. Especially during rifle season, guys become very proprietary about other peoples property-leases or trespass fees are still a rarity here. In certain places, unless 3 or 4 smaller properties can be strung together it's not worth hunting as the possibility of losing a deer running from one property to another is just too high.
Though we all prefer otherwise, sometimes a wounded animal is simply not recovered. I guess that's why it's "hunting" not "shopping"...