I have seen the tire idea work....there was a range I used to go to that had made tire baffles by bolting a stack of car tires together to about 6 feet long, made a horizonal stand for the stack and placed it in front of the rifle bench...you shot with the muzzle just inside the first car tire. It did tame the reports from the range neibors. (it works kinda on the same principle as a suppressor)
Lighten up Francis!.....;Actor Warren Oats, in the movie "Stripes"