I've been pondering this myself. The last couple of weeks, my wife and I have been cleaning out every Wally World we can find. I guess enough is when you can't afford anymore. I only plan to get about 500 rounds each, of defensive ammo. As far as target ammo goes, I'll just keep buying it until I can't afford to purchase anymore. I don't know that you can ever have TOO MUCH?But how much?