At 40fpe in 22Cal I would feel comfortable with Skunk, Pigeon, Black Birbs, Opossums, and maybe Racoons. This assumes good accuracy and correct shot placement. You might try some Nielsen 17.5g slugs as well. I took care of a +5lbs skunk at about the same power level in my old Wildcat and it didnt even spray. Plugged twice in the chest and neither slug made it out the other side.