its strange i was just coming on to ask about this!!, am normaly only shooting for 10/15mins because the man two alotments down complains coz am up "setting his pigeons", even though its like 400yrds away and you can hardlys hear the shots to start with! ive been out this morning with the rabbitstopper and like you said i noticed bad power loss, throught i was just low so changed and happend again! i figued it must of been the cold! thats the only thing about the rabbitstopper, power changeing in the gas all the time it gets a tad anoying, other than that nice little gun!