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Shotgun is kind of a misnomer as I don't know of any that actually fire shot, only big solid lead slugs that stick out of the shell. They are also used for blasting the clinker off the inside of coke ovens and the like. To shut down the oven and let it cool so Mike from "Dirty Jobs" could clean it would cost a small fortune in lost production, hence the "shotgun" which can be used without too much production delay.
Jim
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