Ah, yes, simulated 'coon skull. Take a tennis ball, some Q-tips, one of those Dr. Scholl's Gel insoles, a small balloon, and a can of peas, a razor, and some Popsicle sticks, and then....go get your pellet gun and shoot the raccoon. Either it kills it or it doesn't. If it doesn't, shoot it again. Repeat until the 'coon is dead or doesn't return.
Another option might be those little Colibri .22 rounds.