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

Why are bullets made up of brass, not aluminum?

What Every New Gun Owner Should Know About Ammunition

What Every New Gun Owner Should Know About Ammunition

Why are bullets made of brass in all countries but stainless steel in China?

Blazer 9mm 115-Grain Review: The Not for Everyone FMJ

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

Handloading - Wikipedia

Aluminum Cased Ammunition - A Guide For Shooters

Modern Historical Intermediate Calibers 011: The 5.56x38 FABRL -The Firearm Blog

Decoding Ammunition Boxes

Pocket Hose Copper Bullet AS-SEEN-ON-TV Expands to 50 ft REMOVABLE Turbo Shot Multi-Pattern Nozzle 650psi 3/4 in Solid Copper Anodized Aluminum Fittings Lead-Free Lightweight No-Kink Garden Hose : Patio, Lawn

Firearm and Ammunition FAQs - Grand Canyon National Park (U.S. National Park Service)

Winchester 162-grain Copper Impact Ammo: 'The Flying Salami' - Guns and Ammo

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

Aluminum vs. Brass Ammo: Composition, Weight Performance