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380 ACP (Automatic Colt Pistol) is a compact rimless cartridge also known as 9mm Short. 38 Special is a rimmed revolver cartridge that is significantly longer and does not generally function well in semi-auto guns unlike 380 ACP. Ballistically, 38 Special has more energy but neither of the two are exceptionally powerful. The difference is very visible when you see them: https://ammosquared.com/wp-content/uploads/38-vs-380-Label-1024x576.jpg