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380 ACP vs 9mm comparison 9mm and 380 ACP cartridges — both popular choices for selfdefense rounds — have the same diameter, but a 9mm round is longer The 380 ACP round is cheaper and easier to handle and conceal, while the 9mm is more powerful overall The rounds cSkip to content Menu Menu Shop Menu Toggle Handgun & Pistol Ammo Menu Toggle 9mm;Jun 06, 19 · Size The 380 has the same bullet diameter as that of the original 9x19mm Parabellum, more commonly known as the 9mm However, 9mm rounds are bigger and require a larger pistol The 380 ACP rounds are shorter in size and do better with small pistols The 380 rounds are shorter and fire with less force Caliber Wars 380 Acp Vs 9mm Which Is Better How big is a 380 compared to a 9mm