Same thing happened in '06. The department in the city I was living in had to clean out Gander Mountain to find enough rifle ammo. They even bought the varmint rounds.
One of the silly things I see posted around the internet occasionally is that you should get a weapon in the same caliber as what the local police shoot. Then there is an implication that in times of a disaster the police will lend you some. Who believes such things? Never hear anyone talking about loaning some to the police.
Police and military rounds are the first to disappear and the last to stabilize in shortages.
Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday.