I have heard of a guy that bolted a number of tires together, and then shot through them to help muffle the report.......I never heard it, but reliable people said it help quite a bit with the muzzle blast. In all reality, all you may need is to distort the sound so that it doesn't sound like the classic "Gun shot" and people may not even think twice about it. It would seem like if you got smaller with your tires as you went down the row, it might create a baffle effect and trap some of the muzzle blast......Try it, and let me know how it works! Thankfully, I live where all my neighbors shoot, and it's not really an issue for me!