Bolt action Savage .22 with a suppressor on the end of the bull barrel. Aguila 60-gr. subsonic ammo. Makes a sound like a handclap. I shoot from the living room and my wife in the kitchen (20-25 feet) cannot hear it.

Either that rifle or my Ruger .458 Lott. Depends a lot on the size of the bunny's tusks. I've got a mounted set that go 43 & 47 lb. That was for the giant gray Botswana bunny and required a Searcy .577 underlever.