Do you keep ammo stored in clips and mags for long periods.? Do you rotate ammo ?
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I don’t have the experience to offer any data but I rotate ammo every two days through my mags
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I keep some in mags. I only rotate ammo that is loaded in the gun, to prevent bullet setback. Springs wear from use, not simply being compressed.
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Thx… I’ve heard the same about spring fatigue. Modern spring metal is much more resilient than 30,40 years ago.
I rotate first 3 - 4 rounds (I’ve got 14 rounds magazines). I keep around 10 rounds in mags overnight (lower compression saves the springs). Then I add missing rounds for carry.
When I go to the range I remove self-defense ammo, so everything is rotated anyway.
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I keep em loaded…every week, or 2 at the most, i will empty loaded mags and load new mags letting the primary ones un-compress for a week or 2…then repeat.
haven’t had any mag issues with this process.
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Ar mags loaded (28r) for years. Firearms loaded with sd ammo always run the top 3 reload with 3 new ones. Run the whole mag oncee a year. Just a guess but most 1911 ( 7 or 8r 45acp) if springs wear it shows up in the last couple rounds, perhaps true of all mags?
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I keep a few magazines loaded in my safe 9mm because I use those the most. Some may be loaded there for more than 6 months. They can be there much longer than that and will still be good to go.
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My ammo doesn’t last long, it’s used right away. 
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