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

How to safely remove a cap from a rifle shell - Quora

How do shotguns do so much damage? It's only small metal balls, right? - Quora

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

Why are shotgun shells made of plastic? - Quora

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Has an invention ever been proposed regarding shell-less pistol or rifle ammunition? Meaning no brass steel or plastic casing. - Quora

What is the danger of shrapnel shells? - Quora

Why don't shotgun plastic shells melt? After all, there is an explosion inside it - Quora

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What is the danger of shrapnel shells? - Quora