When the police investigated, and learned that the complaint about people shooting firearms greater than .30 caliber was unfounded, it may have actually benefitted the club. Consistent false complaints would be a really good reason for the club to return to court and seek modification of the order. People complaining about greater than .30 caliber being used, when it is really only calibers that are allowed, would show that the complainants don't know what they are talking about, and that they actually CAN'T TELL THE DIFFERENCE.
Complainants will eventually realize that false complaints hurt them more than the club. Either way, the club wins because either the false complaints will cease, or the complainants will prove that their complaints about excessive noise are unfounded because they don't know what they are talking about.