Eatslead,
This is also not personal, posting your land to protect you from morons with rifles is like getting a protective order against someone. Anyone who would take a shot that could endanger you or your family will hunt on your land signs or not. If protecting yourself is truly what you want make sure you know who is on your land posted or not and make sure they know where your house etc is. Posting will not stop the idiots with arifle, shotgun, muzzle loader or pistol.