Why are bullets made up of brass, not aluminum?

There are many benefits to using brass bullets instead of aluminum ones when shooting firearms — including improved accuracy and performance

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Why aren't bullets made of aluminum? - Quora

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Can any metal be used to make a bullet? - Quora

The Truth About Brass vs. Steel Ammo - Pew Pew Tactical

ammo is so rare that I polished it instead of taking it to the range. Right side is not polished. : r/WA_guns

Why aren't ammo casings made out of aluminium instead of brass (brass which is way heavier than Al)? - Quora

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