One thing that makes me nervous sometimes is leaving a loaded gun locked in my car in the summer heat here. We hit the mid to upper 90s on the hottest days, and that's got to be multiplied inside a sealed car. Are there any dangers from the heat getting to the bullets?

Also as hot as our summers are, our winters can go the other extreme in cold. Let's say I go out to my car at 9pm in 15-degree weather and am met by a dopehead wanting me to go back in and get him some free Oxycontin. If I were to shoot him, could the heat from the bullet tear apart the very cold gun?