If he's out there shooting up his back yard then I'd assume that someone would call the police.
I shoot in my back yard all the time.
In the freer states, it is hardly uncommon for patriots to take advantage of their own property to memorialize the days when they set up target practice.
That was, of course, before the infamous “Take All your Firearms to the Nearest Large Body of Water for a Boating Excursion” day.
Alas, the casualties of that fateful day are uncountable.