I brought a similar topic to this a few weeks ago. You may be able to find some answers here.
People on this board have fired ammo from WWII. It’s all a matter of proper storage.
It was determined that cycling ammo is more to keep up proficiency with carry ammo than “will it work”. You are more likely to have a malfunction with your gun than have issues with quality ammo (you do need to make sure the ammo you buy runs in your gun. Some guns can be picky. This isn’t a bad thing, but you don’t want to buy hundreds of rounds and find out you’re gun can’t cycle it.