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Some pistols do not have fully supported chambers. In other words, the chamber is cut away at the feed ramp to improve the ability to feed from the magazine into the chamber. When the cartridge is fired, the brass will form a crescent-shaped bulge where the feed ramp in located. This generally isn't a problem with factory new 9mm ammo, but has been known to cause kabooms in 40 S&W and 45ACP.
Reloading brass cases with bulges is not worth the risk. Toss them.
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