Non lethal rounds, I hope? Firing lethal rounds at somebody just for wandering onto your property is definitely illegal everywhere in the USA. You would have to have reason to believe they are threatening your life before lethal force would be an acceptable and legal response.
I'm actually not even sure firing the non lethal rounds would be legal, but if not it certainly wouldn't get you the kind of time you'd be looking at for attempted murder. If you've got trespassers, tell them to leave and let the police sort them out if they don't. You can keep a gun handy just in case, but don't even point it at them unless they are being threatening (yes they can get you charged with assault in some cases)