The Second Amendment: A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms, shall not be infringed. As you can see the 2nd amendment doesn't say a damned thing about the right to own ammunition and/or bullets.
Chris Rock, I believe you're on the right track. Tax the Hell out of ammunition and/or bullets and kill two birds with one idea: Stop the killings and pay down the National debt.