Unless you fire sub-sonic ammo, a silencer is of little benefit. It's the sonic crack that generates the most noise. At our old shooting range we had a berm to get behind which was about 150 feet perpendicular to the 200 yard range. In this way we could pull targets without walking the 200 yards each time. At this location you never heard the report of the rifle, just the sonic crack echoing off everything. It was impossible to tell where the actual firing was done. In a .22 the sub-sonic ammo is no problem, but not easy to load down .308 and such to sub-sonic.