Naah. Most problems with old ammo relate to corrosion gumming up the works in your gun, or loose primers (pushed outwards by water intrusion) getting dislodged and getting stuck. I had a round of Indian .308 do that to my FAL a year or so ago.
The only potentially dangerous or permanently damaging problem which I've ever heard of from old ammo is pierced primers, which can cause all kinds of damage, esp. if the gun, like some ARs, has a Titanium firing pin. It can also injure the user through burns. On some old and unsafe designs, like the infamous Carcano, such a rupture could potentially be fatal, owing to the exposed striker and firing pin, but I doubt anyone would be crazy enough to use old ammo in a Carcano...come to think of it, I'm not sure anyone would be crazy enough to use -any- ammo in a Carcano!
Now problems with old -guns-, on the other hand, can easily get you killed.
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