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

/media/jjhcamtb/trench-gun

The 17 Guns Americans Used to Win WWII - 24/7 Wall St.

Firearms — National Museum of the Royal New Zealand Navy

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

Winchester Model 1897 - Wikipedia

Forgotten U.S. Infantry Rifles Of World War I

What types of shotguns available in the US have the ability to attach a bayonet, other than the WW1 trench shotgun? - Quora

Were shotguns actually terrible in WWI? - Quora

Shotgun : The Forbidden Weapon Of World War 1