Thats gonna be different for every person, theres not gonna be any good answers here AND its a silly question to begin with. You want enough ammo to where you dont need to worry about buying it for the foreseeable future. You want practice, defensive as well as hunting ammo if youre a hunter. As you cycle through your ammo you replace it. Keeping your own armory to a place of confidence and a level where you are set. Its best to buy in bulk to save money. If see a great deal jump on it. Ammo.seek is your friend