In Illinois it is a felony to own a single cartridge without a valid FOID card. In New York you need a valid pistol permit to purchase any ammo which can be loaded into a handgun, even if a rifle will also accept that same ammo. In New Jersey it is a felony to own hollowpoint ammo. It is already a crime for any "prohibited person" to possess any "ammunition component" which would include a shell casing or one of those stupid bullet keyrings they sell at the flea market.