Marlin bolt action .22mag here for jacks and coyote. Cottontail I use the good ' ol .22Lr. The .22mag. punches a too big a hole out of a cottontail , but it' s not bad out of a jack. Coyote pelts are not damaged much from a .22mag. It' s not that a .22Lr won' t knock down a ' yote , I feel more comfortable with it when i' m gonna take out a 35-40 lb critter.