hummers (aquila colibri "hummingbird".22longs - uses eley priming compound only) make less noise than the sound of their lead hitting the cardboard and trap metal. not at all particularly accurate, but good for trigger and sight control on the spur of the moment (not to mention the voles i've dispatched in the back yard). here's 20 rounds shot in succession through a mark II fv @ 9 yards. the aiming dot is 1" and the rifle would blow out the dead center @ 25 yards with cci standards. that one super low flyer made zero noise, bad primer compound for sure.