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.380 ACP is 9x17mm, while the 9mm Parabellum/Luger is 9x19mm. Additionally, the 9x19 uses heavier projectiles, and also generates higher chamber pressure, necessitating a locked breech pistol, whereas most .380/9x17 pistols use an unlocked breech.

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Q: What is the difference between 9MM caliber to 380 caliber?
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