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Powerful in which way? Artillery pieces are capable of firing flechette rounds, essentially making them oversized shotguns.
As for the shotgun as defined as an individual weapon, the largest bore I'm aware of was the six gauge shotgun. Not a very practical battlefield weapon, however. Militaries typically use a .12 gauge shotgun, chambered for either 2-3/4 or 3" shotshells. Western nations lean more towards low brass munitions, while former Bloc countries and their client states lean more towards high brass shotgun shells.
Military shotguns aren't the most powerful - .12 gauge is pretty run-of-the-mill. However, some models are capable of pushing out an impressive amount of firepower, to include fully automatic fire, such as the Atchisson AA-12 or Pancor Jackhammer.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoAA-12
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