I can’t imagine what’s illegal about having too much ammo and stating the world is going to end. I think the world is going to end some day(as stated in the Bible, a book most people in this country used to believe) and I have 100 rounds of ammo. Should I get rid of all that ammo so I can still hold that belief or stop believing that so I can keep the ammo?
If the world really ends, it won’t matter whether you have one round or 1 million rounds.
Nothing, yet, AFAIK, but if you have a restraining order from an ex Significant Other, or a current one for that matter, you've just become federal felon. Even if your possession of that ammunition and/or firearm was as part of your official duties as a police officer or military member.