Welcome to the Community, @Edison_R! I don’t know if there is such a thing as overbuying ammo. 
Here’s an topic on storing ammo that might help: How do you store your ammo?
In the top right corner you’ll see a magnifying glass, you can use that to search all of the Community. There are a ton of conversations about ammo. If you don’t see what you’re looking for, please feel free to start a new topic and ask your question there.
Very true, @Matthew47, money cannot buy your safety or replace your family. Glad you’re here!