Depending on your situation, location and whether you will have other means of defense or hunting I think an assortment of buck shot, bird shot and slugs are in order. Depending on the game involved the buck shot and bird shot can be replaced with something in between. Slugs would take down bigger game like white tail.
"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington