Jim, there are lots of ways to protect ammo.
Buy old US (or I assume Canadian) ammo cans. These seal fairly well, keeping out moisture and can be locked by attaching a hasp to the side. Some of the ammo cans also have rubber seals that would work even better.
You can also buy survivalist containers that are completely water-proof.
With the heat, then cold, then heat of being in a shed, I would expect ammo to not last as long, but easily should be fine for a few years to longer. My ammo is out in the wood shop, unheated / cooled and I am not worried about it.
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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