***Although the camp has had a shooting range for rifles and shotguns for years, noise has not been an issue until now.***
Sounds like people who just moved in and now want the “old-timers” to change their lives to suit them.
It’s going on all the time all over the country. Let them sue the developers who did not apprise them of the noise, or better yet, Caveat emptor should apply.
It doesn't work that way. Almost all communities have laws on the books dealing with noise in residential neighborhoods. If the shooting range is in violation of those ordinances, then it's at fault and it doesn't matter who was there first. That's just life.
When I was a kid, we used to race motocross at a track located East of Colorado Springs. When the city grew Eastward, and the noise bothered those in new developments, the track had to close. That's just the way it works.