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5,133 Posts
If properly stored I believe shelf life would be almost indefinite , I have shot a lot of mil surplus ammo from the beginning of the last century LOL . That being said personally I would consider 2 years as the MAX time to rotate defensive ammo , and would seriously look at doing it sooner due to the fact cycling ( unloading and loading for cleaning , target practice , ect.. ) the ammo can have a certain attrition with burred extractor graves , bullet setback creating dangerous overpressure ( most of the famous glock kabooms ) ect.
