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

Can a firearm fire different caliber bullets? - Cedar Mill Fine Firearms

Cartridge, Types, Calibers, Ballistics

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What Is the Difference Between Bullet Sizes? - Interesting Engineering

How many shots does it take to break in a barrel? - Quora

Throwback Thursday: All About .32 Caliber Pistol Cartridges - The Shooter's Log

Would it be possible to create a firearm capable of firing 2 different calibre bullets from the same barrel? Example 5.56 and a 7.62, could the smaller cartridge be cased similar to

How is it determined not only how much internal pressure a gun barrel can withstand but how much pressure a given bullet (lead, copper coated, tungsten, etc.) will create when fired?

GUNS Magazine Reloading The .32 Rimfire - GUNS Magazine

Can you fire a .22 WMR bullet through a .22LR barrel? I know the WMR is .224 and the. 22LR is .223, but does the .001 make that much of a difference

Does shooting a barrel of oil really cause it to explode? - Quora

What are the Fastest Firing Guns?

Can we cancel a shoot if the bullet is already in the barrel? - Quora

How is a cartridge in a revolver perfectly aligned with the inlet of the barrel? Wouldn't even minute misalignment be hard on the barrel and the bullet? - Quora