I keep stopping at various Walmarts around my state and I like to pick up ammo for my 9mm and .40. In the past month, they are out of 9mm and .45acp and literally have 1 box of .40 which I buy...each time they are out of other calibers but have the .40. When I see it I get it. I can buy on line, so I am not concerned about getting ammo, but...what does everyone know that I don't know? Why the rush on ammo?