A shotgun round is made up of six basic parts: the primer, base, powder, wad, projectiles (shot), and hull.
The four parts of a case are the case, the primer, the propellant, and the bullet. It is irrelevant in a legal setting whether the bullet is plastic or whether the case is composed of aluminum or cardboard rather than brass.
Modern shotgun shells often have a plastic hull with a thin brass or plated steel covering at the base. Paper shells, which were once widespread, are still manufactured, as are shells made of solid brass, as was already mentioned.
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