Why not use a rat trap? Or is it too large?
LOL, way too large. I have a HaveAHeart trap, and it is too small, so I borrowed a bigger one, and he is too wily to go into it. (although I did catch a smaller one a few years back. I was told it is illegal in my stupid state to move them after trapping, but to me, that is a law made to be broken.
I took it about five miles away to an area where they have community plots where the Lefties grow their little crops, and let him loose near there! Probably living the life of Riley since then...:)
And maybe get some pissed off hippies too!
Havahart makes live traps in larger sizes. I've used the smaller one to trap attic squirrels. Once you've caught it you can drown it, shoot it, relocate it, whatever. The slingshot might only result in an injured animal, not a kill.