Are there any cases of a small calibre bullet being fired into an

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Will a solid steel bullet, not casing, ruin the rifling of a barrel with one shot? I have found such rounds in clay pits. - Quora

Is there such a thing as a bullet sleeve that would allow a smaller caliber bullet be fired from a larger caliber rifle? - Quora

Army Ammunition Plant Is Tied to Mass Shootings Across the U.S. - The New York Times

NRA Women Do .22 Mag. Snubnose Revolvers Make Sense for Self-Defense?

Will some inexpensive hollow point ammunition sometimes leave the jacket in the barrel with the lead being 'blown' out of it? Is this a particular risk with certain calibers? - Quora

How do revolvers seal the pressure in the barrel to push the bullet? There is obviously a gap between the cylinder and the barrel, and the bullet will basically hit the barrel

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