There has been a progressive shortage of ammo since the invasion of Iraq. The ammo makers have been filling government contracts and that takes away production capacity from civilian contracts and calibers. When you have two or three wars running for years, there is going to be ammo shortages.
http://www.dailyrecord.com/article/B...-AMMO-SHORTAGE
http://www.nj.com/news/index.ssf/201...reating_a.html
http://www2.wsav.com/news/2013/jan/1...025-vi-158639/