If there's ANY chance at all of someone walking into where u r playing then netting is pretty important. Even if its private land with no public rights of way, its gotta be worth putting at least warning signs of some sort up.
It's private property, the only people that could possibly be hit are hunters, but they hunters shouldn't be there anyway because it's, as I said, private property.
Emerson, I mean I wouldn't want to get shot by a hunter hunting deer illegally. Very remote chance that it would happen though. But, there is a chance.
netting would be sencible but can be expencive although you can some times get it second hand from building sites obviously check it's condition wear and tear ect as it is nylon it dose not perish as such but loses it's strenght so should be checked. Over here it comes in three width sizes.
I would deffinatly say warning signs.
Also remember it is all to easy not to think if you have a few freinds in a small area.
So I would also recomend a small netted safe zone for fiddling with guns and stuff.