The Americans used shotguns in WW1. What ammo did they use? Did

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The Americans used shotguns in WW1. What ammo did they use? Did they use Slugs or Sabot or 'just' buckshot? What were common bullet weights? - Quora

Why did Germany not use shotguns? - Quora

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World War 1 History: Germany Declares Shotgun Inhumane - Owlcation

Why did Germany ask the USA to stop using trench guns in WWI? - Quora

In the US military, when shotguns are issued, do they use standard buckshot, slugs, or something else? - Quora

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Was American use of shotguns in the trenches of WW1 objectionable as the Germans claimed? - Quora