I live in the country...woods. sound travels. The nearest house to me is 650 feet and I can hear talking from their yard. The police and whoever arrived no more than 30 minutes after they heard the gunshots. I am not arguing this, but speaking from personal knowledge. I hear gunshots all the time, but I stay awake for a bit to make sure they were innocent gun shots.
I'm not accusing the neighbor's of anything, just stating I think it odd.
I lived in the country in MN . My daughter lived three hundred feet to the north. Son, three hundred feet to the east. I never ever would hear anything. No cars. No talking.
But, I could hear gunshots all of the time from people shooting . It wa totally against the law. You could not shoot wothin 300 feet of any bulding That included sheds.
I always thought it would be easy to shoot someone where we lived because no one pid amy attention. Altnough if I heard a lot of shooting I would not take a walk. Deer season we stayed in the house even though deer hunting was forbidden anywhere near where I lived.
Sound depends on the wind, your elevation, their elevation, the loudness.