[QUOTE=Texas by God;4628091]Stubbed inside a single shot shotgun and chambered appropriately- the possibilities are many.
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By your screen name I would think you like black powder guns. Now assuming this is a piece of barrel from a 43 Mauser and you had access to a metal lathe, I think you could make a chamber adapter to shoot a .440 round ball with a small charge of black powder using a empty primed 45 ACP case to fire it. This would be in a 12, 16, or 20 ga. Break action shotgun. Even if the OD of the section of barrel is smaller than the shotgun bore a piece of other metal or plastic can be pressed on or epoxied on and turned to the dimensions needed to center it in the chamber and bore.
I know this sounds crazy but I have made just such of a chamber adapter and it worked fine.
Just a idea to make it useful.
Jedman