Dale, it brings to mind a Myth Busters episode I saw where they let centerfire rounds cook off in an oven. As I recall, rounds sitting alone in the oven, but not in a gun, wouldn't penetrate the oven door upon firing. However, rounds left in the gun would go down the barrel just as if the trigger had been pulled, and blow right through the door.
Seen on a bumper sticker: "Exercise. Eat right. Take vitamins. Die anyway."