IIRC some of the frangible ammo has a short shelf life because the bullet itself, after a period of time, won't hold together when fired.
Then you have people like this David what's his face, that honestly believe because of what they see on TV, that ammo in a fire will fired the bullet out just like it's being fired from a weapon.
My goal is to have 200 little boxes of TTSX, GMX, Nosler Partitions, Pro Hunters, ect on my reloading bench; more than I'll ever use the rest of my years. But for sure, since I started reloading and built my back porch bench & target; I do shoot guns way more. No joke, I have over 100 boxes of hunting bullets now; and glad I bought them too. I look for prices to keep going up as the powers that be try to go after hunters & gun owners. To me, it's no different than having a little gold.
I had a buddy lose his cabin to fire last winter, lost all his guns in the vault too. He had most of his ammo outside in storeage shed, but still had loose rounds lying around throughout his house which you could hear going off all night. I've often wondered if extreme cold (minus 60) and a long Alaskan winter would affect ammo, primer, or powder if stored in rubber sealed army ammo box with large block desicant inside? What do you think?