Yes, reckless endangerment. I have a friend that was arrested for exactly that. They were on private property, away from any houses but close enough to be heard. A neighbor called and complained. The cop that responded was dammed and determined that he would find something wrong with what they were doing, even after calling a Game Warden to see if there were any hunting regulations that they might be violating. The Game Warden stated "I don't see anything wrong with what they are doing". But, because they had had a beer, he arrested them for reckless Endangerment.
Make sure you have taken all of the precautions for a safe range. Targets, backstops, etc. And NO ALCOHOL!