20 Gauge Ammo

20 gauge shotgun shells. 20 gauge ammo is available in many varieties to suit the many uses for a 20ga shotgun. However, all 20ga ammo shares one distinctive feature: a bright yellow hull that serves as a visual aid to prevent loading of 20 gauge shells into shotguns of other types. Many shooters prefer 20 gauge shotguns for their relatively light recoil and ease of handling.