Actually, the little old ladies are smart consumers. They are responding to the Obama administration’s clear signal to the market that some sort of stricter gun control is coming. From the Associated Press:

“We have heard from all across the country that there is a tremendous shortage of ammunition,” said Lawrence Keane, senior vice president of the National Shooting Sports Foundation. “We’ve heard this from the manufacturers, that their customers are calling them trying to get supplies for inventory, and that the manufacturers are going full-bore, pardon the pun.”