I buy 22, 9mm and .223 by the case since I shoot a lot of it. When ammo got really cheap a few years ago I started buying 9mm two cases at a time once or twice a year. But I do not shoot 308 and 12 gauge very often so I buy it by the box. With 44 it is somewhere in between. I typically buy about 250 to 500 rounds at a time.

I have a friend that claims if the UPS guy can get all of your ammo order to your door in one trip with a hand truck you didn't buy a lot of ammo. So by his standards I have never ordered a lot of ammo.