I'd say mostly the war. A lot of ammo has been expended over the last few years. A lot of lead, copper, brass, primers, powder. Try getting some NATO 5.56mm ammo anywhere. And the primers are used in more than just that ammo.

?_________
|_|_|\____\___
l-----[O]≡≡≡≡[O]
()_)()_)-----)_)

Stay the Trail!