I keep a small sealed ammo box in the trunk of my car with a backup box or two of my usual calibers in case I'm at the range and decide to shoot more than I intended when I left the house. Most is range ammo but I also keep a couple magazines loaded with HST JHPs, you know, just in case.
Summer/winter temps in Kansas can vary by 100° or more.
Something tells me this probably isn't a great idea but I'd like input that's more than just speculation.
I'd give my right arm to be ambidextrous.