I would use a small shed. Hopefully you can set your range so your neighbor's property is behind the shed. Then plant evergreen trees such as aborvite around the shed and out the front of the range to help absorb the sound waves energy. You can some times find evergreens at christmas farms. My uncle has a farm and had some trees that didn't suit anyones tastes. He had to dispose of them. You might find some for the taking.
Remember if changing things around to try to shoot north if possible.
Our club tried the tire baffles with little success and many headaches.