That should do the job fine. No need for a definite head shot (the skull can actually be a problem for penetration), about anywhere on a rabbit in the front half of the body will bring it down or at least give you an easy finishing shot. At least that's my experience with pellet rifles and bb guns. At 500 fps, you should be set out to 30yds or so. Rabbits are easy to bring down You might try Gamo's new pellets that are supposed to give up to 25% more velocity and deeper penetration if you want more power.