If you enlist their wives maybe they will talk to the men.... “Did you see that white deer? Pretty neat isn’t it! Wonder if it will make it til winter!
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Their wives wear long, flowing body covering ‘robes’ & head coverings, if you get my drift. They are neither friendly, nor good neighbors - there are times when lots of shooting happens, sounds like multiple people going through a lot of ammo. I would not visit on their property without being accompanied by a Special Forces/Ops team (no joke).
So the local police force is aware of them running a shooting range on their property? Maybe keep track on a calender. And if they are shooting wild game the local warden would need to know so they can check their hunting permits? (Maybe the warden should be alerted to the fact that there is a white deer in the area?)
Good luck!