Ok two things sir, first contact the senior leadership (chief) of whom ever the officer belonged. Be respectful but ask for clarification of the legality of shooting on your property and if he didn't mind a letter from him stating his interpretation.
I think you are legal in Henry County as long as you are on residential property and not within city limits.
Second, courtesy will get you way farther than piss and vinegar. Man up and go apologize to the fellow who felt the need to call the cops for you legally "shooting" on your own property. You may find the guy works nights and was trying to sleep or you may find a single woman who scares easily and the shooting frightened her.
Take another right step and offer to allow them to shoot on your property as well and if they don't shoot offer to teach them. Offer to contact them before you shoot so they know what's going on and offer range access again.
At a minimum make them aware that you are a responsible adult and an asset to the community rather than not. We the shooting public already have far too many enemies and there is no need to add to the list.
Good advice