I lost all my ammo in the same avalanche that took all my firearms.

Prior to that, I had all shotgun shells in one steel, lockable cabinet and long gun/hand gun ammo in another same type cabinet, both bolted to the floor and wall, in a closet. Kept some hand in the gun safe on the top shelf. No desiccant in the cabinets, pretty dry here year round, and a golden rod (I think that is what its called) in the gun safe.

I can't say how much I had before it all got swept away, I can barely count up to 20. I know it was more than 20, though!