Don't blame the gun range. They were here before any of us, and you are objecting to something that is literally an unavoidable part of how they do business. What time do they close? Is it really that onerous to wait until then? Why did you move next to a gun range in the first place if noise was going to be an issue? It's like moving to an apartment over a bar, and then filing noise complaints for the live music at the venue beneath your feet. You're literally ruining their business and blaming it for your slumping property values when the property market has been tanking for years.