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

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

Is the 45ACP designed with insufficiently thin-walled shell casing, or in other words, is there too little room in the chamber for thicker and stronger shell casings? - Quora

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

What is the danger of shrapnel shells? - Quora

Why don't shotgun slugs and shot use full metal jackets and why don't other guns use plastic casings? I believe shotgun shells were originally full metal. - Quora

What is the danger of shrapnel shells? - Quora

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