Shotguns generally use shells, although some models can also fire slugs. Shotshells contain multiple small pellets (typically lead or steel) embedded in a plastic or paper wad, which is surrounded by a brass casing. The pellets are dispersed when the shell is fired, creating a spread of projectiles. Slugs, on the other hand, are single, solid projectiles that are typically heavier than pellets and designed for greater range and accuracy.
