Brass vs Steel vs Aluminum Ammo Cases: Which Is Best?

At a glance

• Brass — most reliable, reloadable, corrosion-resistant, and allowed everywhere; costs the most.
• Steel — cheapest in bulk, but not reloadable, can corrode, harder on extractors over time, and banned at many indoor ranges.
• Aluminum — light and cheap, but soft and not reloadable; fine for casual range use only.

Brass — the gold standard

Brass is corrosion-resistant, seals the chamber well for consistent performance, is easy on extractors, and is reloadable many times. It costs more up front but is allowed everywhere and lasts in storage.

Steel — cheap but with trade-offs

Steel-cased ammo (common in 7.62x39mm) is cheaper, but it can corrode if exposed to moisture, is usually not reloadable, can increase extractor wear, and is banned at many indoor ranges due to spark/backstop concerns.

Aluminum — budget practice only

Aluminum is light and cheap but soft: the case can be marked by the ejector, it isn't reloadable, and it seals the chamber less tightly than brass, letting a little more residue blow back into the action. It's fine for casual range use but not the choice for serious or precision shooting.

For most shooters, brass is the best long-term value — especially if you store ammo or reload. Compare 9mm prices by case material on the listings.