Normal fluctuations in household temperatures are ok.
Ammo storage in attic.
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Don t store your ammo in.
Your storage method will determine the shelf life of your ammo.
I would however avoid extremes such as basement storage or storing ammo in the attic.
When choosing an ammo storage location shoot for dark dry and cool not cold.
It measures 11 x 6 x 4 inches which is more than enough room for your ammo and other gear and valuables.
A basement even a damp one that remains cool or even cold year round is far better for ammo storage than a garage or attic that bakes your ammo by day for months on end in the summer.
A closet inside a home is ideal.
Never keep your ammo in the attic or the garage.
Keep your ammo dry.
So think twice before storing ammo in your car during the summer months.
And if you stash away boxes of ammunition in an attic garage or cellar that receives a lot of sunlight during the day you might want to move them to a cooler part of the house during the summer months.
The best advice i can provide is where not to store your ammo.
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