I've tried looking through the reference desk manually but can't see this being asked- sorry if it has been.

Mad-Eye/ Barty Crouch Jnr says in GoF that it is highly likely that someone could cast the Avada Kedavra curse and not actually kill the person in question. So if this was done, then do you think the caster would still get a life imprisonment in Azkaban for attempting it but not being magically powerful/ not hating the person enough to do it?

If not what sort of sentence would they get?