I`m moving to the country but I will have some neighbors fairly close to my home . I would like to target practice with my .22s but I don`t want to bother anyone. I`m thinking of making a [muffler] out of a heavy cardboard tube maybe 8 to 10 in. in diameter and lining the inside with fiberglass insulation.Has anybody tried something similar, was it effective, or does anyone have any ideas that might work ? Thanks in advance , Paul.