"If yo've ever bought ammo for a gun you don't own yet, you might be a gun nut."
If you have the gun and intend to load for it and shoot it, you don't need a minimum number of cases. I started reloading 44 mag. with 50 cases that I'd bought as a factory loaded box of ammo.
Most of my 45 ACP brass is range pickups. Seems I always come back from shooting with more 45 ACP brass than I left the house with.
If you're loading and shooting, the brass will find you.