I used to shoot woodchucks with anything I had ammo for. .22, .223. .270, .308, 30-06, 16GA and 12GA slugs. Grandpa wouldn't let us shoot the Mauser he brought back from Europe, and Dad didn't want us using his .45's.
I used to wait until I heard one whistle, hit the deck, and watch for his head to pop up to see where I was. Makes for a very acrobatic and messy back-flip! The worst mess I ever made was with the Winchester 12Ga. Rifled slug from about 10'.