Ammo IS gone. Has been for about a month. The only thing you will find right now is less commonly used but still popular calibers. .270, .25-06, etc. and a small amount of premium priced premium stuff, high dollar personal defense rounds and the like. Or, get really really lucky when some store just got something.
The last serious shortage we had was after the 2008 elections. It was the best part of a year of significant shortage/price hikes and nearly 2 years before supplies caught up and leveled off. It wasn't until about 2011 until I felt like supplies and prices had gotten back to normal levels, though prices stayed higher than pree-2008. The current panic nothing at all like that. This is far, FAR worse.
This shortage is 100% politician driven. It is all panic buying due to the expectation that the Sandy Hook tragedy is going to be used to push new gun control. Well, not expectations exactly, more like absolute certainty. EVERYthing is getting sold out. It started with ARs, high-cap auto pistols, and ammo for same but is spreading as people who can't get their first choice are buying whatever they can find.
Hitting reloading components too. Good luck finding primers right now.....