Hornady, an ammunition manufacturer located in Grand Island, Nebraska, offers answers to concerned customers on the FAQ page of their website:  

Q: Have you stopped production, or has the government forced you to stop?
A: Not at all.

Q: Since we can't find your product you must be selling it all to the government.
A: Nope, less than 5% of our sales are to government entities.

Q: Why can't you make more? Ramp up production? Turn on all the machines?
A:We've been steadily growing our production for a long time, especially the last five years. We've added presses, lathes, CNC equipment, people and space. Many popular items are produced 24 hours a day. Several hundred Hornady employees work overtime every week to produce as much as safely possible. If there is any question about that - please take a tour of the factory. You'll be amazed at what you see.