Who ever said you need a rifle to hunt deer? Heck, you don't even need a dedicated slug gun to do it. Luke explains that any bird gun will do as long as you use the proper slugs. Granted you won't have accuracy you would with a rifle or a slug gun but it will get you in the tree and give you the chance to fill your freezer.
If you're looking to give whitetail hunting a try this fall but aren't sure you'll like it or don't want to go all-in and invest a bunch of money into a new gun-- just grab your shot gun with its bird barrel intact and pick up some Federal truball slugs or other slugs designed to shoot out of a smoothbore barrel.