How can a shotgun shell with a powerful charge use a plastic case

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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 can a shotgun shell with a powerful charge use a plastic case, but rifle shells have to be metal? - Quora

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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

What is the wall thickness of a shotgun shell? - Quora

What is the technique used to cut in half Nautilus shells without breaking them? - Quora

Do you agree with Lloyd Austin's statement that it would be impossible to collect 17 million shells from all over the world? - Quora

How can a gun be shot if it's plastic? - Quora

Why are shotgun shells made of plastic? - Quora

Why are 410 shells so expensive? - Quora