About ten auto tires or 16" truck tired wired or fixed together and the noise is almost gone.I doubt very seriously that you will get unburned powder in the tires from shooting a rifle .We have run 40-50 rounds of 50 cal of BP thru them also. No flash

Last edited by saddlesore; 05/12/15.
If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles