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

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

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

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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

What is the danger of shrapnel shells? - Quora

When did the ammunition industry switch to using plastic shotgun shells from paper? - Quora

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

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

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

Seeing that shotguns use plastic shelled rounds, why don't guns generally use plastic shelled rounds? Would it not be cheaper and just as effective? - Quora

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

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Plano Shot Shell Box Dick's Sporting Goods, 59% OFF

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