And if you go buy a thousand-round tin of 7.62x39 and you are only going to use it at the range over the next year, you should also have nothing to fear when the ATF comes knocking on your door to look around "just to be sure" right?
They already track such purchases in many locals. In some states, that is considered an arsenal and you will be in deep do do if you have that much ammo on hand.
Thank God Iowa isn't one of them.