I'm hearing a lot of contradictory information as to what is the source of the recent shortage of ammunition. Is it government purchases, consumer panic and stockpiling? Who knows. At least there are investigations underway because the current situation is just ridiculous.
"The GAO is entering the investigation just a few days after legislation was introduced in the House and Senate to prevent agencies, except for the Department of Defense, from buying more ammunition and making their stockpiles greater than they were during previous administrations."
GAO Investigating Homeland Security's Ammunition Purchases