I've had mags & ammo in my GHB for years. I wouldn't leave ammo or a charged mag laying on the dash in the HOT South Carolina sun. But, it shouldn't be any problem in a range bag or GHB.
Let's put this discussion to bed. Here is the SAAMI recommendation on ammunition storage, but please read the entire item as it lists many different storage conditions from wharehouses to auto trunks. It should also dispell some internet myths we all have heard. Also note the address at the bottom of page one Ironic?
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