Ammo belts appear to have a json flag that identifies them as a cold food, and the bulleted qualities section in their item description reads "This food melts when not in a very cold climate, and tasted must better when frozen".
I don't get temptations to eat my bullets.

Shown is the .50 belt, the .223 and .308 exhibited a similar trait.
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The flag MAG_DESTROY has wrong description.
My bad, in #44706 I added MAG_DESTROY flag with wrong description. 
The fix is to basically remove the "info" section from this flag in json.
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The flag
MAG_DESTROYhas wrong description.https://github.com/CleverRaven/Cataclysm-DDA/blob/d10f768cdba15dd6a42d17be5bdc1514d883bb5d/data/json/flags.json#L393