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Not all firearm cartridges are. Some casings are made from steel or aluminum. Brass is used because it is a soft metal, and established a tight seating and seal in the chamber. Additionally, soft metals such as brass put less wear on chambers and extractors than aluminum or steel. Brass is also desirable for those who handload, since brass casings can be used for reloading.

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Q: Why are firearm cartridges made from brass?
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