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

What Every New Gun Owner Should Know About Ammunition

brass case, aluminum case, steel case, doesn't matter, Glock will shoot it all : r/Glocks

WOUND BALLISTICS - Motion and Effects of Projectiles in the Human Body - White Mountain Forensic

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

Aluminum VS Brass Ammo: Head To Head Comparison

Goodbye, Brass? An NRA Shooting Sports Journal

Handloading - Wikipedia

How Does a Bullet Work? - Black Flag Armory

Materials for 50 Caliber Bullets - Lilja : Lilja