Why don't shotgun slugs and shot use full metal jackets and why

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Why do shotgun shells have brass or steel encasing the base while the rest of the shell is composed of paper or plastic? Is it necessary? - Quora

How dangerous or painful is the recoil of a shotgun? Which shotgun had the strongest recoil and what features of that shotgun make it this way? - Quora

What is the point of having shotgun slugs as opposed to bullets

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Why is there a limit to how many shotgun shells a shotgun can hold in the US? - Quora

Why don't shotgun slugs and shot use full metal jackets and why

What are shotgun slugs for? - Quora

Why do shotgun slugs have a wad instead of being just a bullet with a casing and slightly larger slug? - Quora

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