Apparently, the problem does exist, but isn't as serious or as common as that old article I read warned. I wish I could recall where I saw it.
I normally have most all of my ammo and reloading components in my basement, which is heated in the winter, and cool and dry in the summer. The walls are poured concrete, and I learned after one summer to avoid leaving the door or windows to the outside open for any length of time. Doing so permits the hot humid air to come in and begin to condense on the much cooler concrete. If I keep things closed, I rarely need to run a dehumidifier, even when outdoor hunidity is highest.
So far, the only ammo storage problem I ever had was with some old Winchester promo field loads that I had bought probably 20 years earlier at a going out of business sale of a gun store. Those had spent several years in another basement that wasn't as dry as mine. Several shells were hard to chamber, and I noticed that the plated steel heads were a bit swelled, and had cracked. I didn't try to fire the shells that had small cracks, and the others seemed ok. I wish now that I had cut open the cracked ones to examine the wads and other components.
