A 03.06 seems a bit overkill for a cat, unless you've got cougars. Sorry, horrible pun I know, but it was too obvious to let it go by. I find that just the domestic cats in the neighbourhood are bad enough, never mind the feral ones, they dig and crap in the flower beds, kill birds and squirrels, fight with each other and make awful noises... On the other hand, I haven't caught a mouse in the traps in my garage or garden shed for a couple of years, so they're not completely useless, but I shoot at them if I see them lurking around the bird feeders. With a slingshot or a low velocity pellet gun, I don't want to kill anyone's pets, just bruise them so they'll learn to run when I appear at the door.