Back in 2007, Mythbusters did a show (ep 85) about bullets in an oven. Once the oven got hot enough, those bullets exploded- not with lethal force, so the myth was busted -with the shell casings causing the most damage.
Why do I bring this up now? Because just last week, a woman in Tampa Bay, Florida, was injured when she was shot by an oven. A magazine in the oven exploded, spraying her with casing fragments.
She was preheating the oven at a friend’s house, a friend who neglected to tell her he stored his ammo in the oven.