I am not sure why some recommend such powerful rounds for raccoons. I do a lot of airgun shooting. Higher quality air rifles regularly make single hole 25-yard 5-shot groups less than .20 inches center-to-center. One can make 50-yard 5-shot groups that are easily .5 inches or less. At such distances, air rifles often make groups equal or better than .22 caliber rifles can.
A quick cruise of the Yellow Airgun Forum shows that its members take raccoons all the time. By placing a premium on bullet placement - that is, waiting for the raccoon to turn his head, then firing at an imaginary spot between the eye and the ear, the airgunners always hit the brain. Much less messy than having to bring out the fire hose when you're done.
could it have something to do with it being a handgun and not a benched air rifle?
good to see the airgunners always hit the brain and never ever miss