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Is 380 auto the same as ACP?

No, .380 Auto and ACP are not the same. While both are centerfire cartridges, they have different specifications and dimensions.

.380 Auto, also known as 9x17mm, is a semi-rimmed cartridge designed by John Browning in 1908 for use in semi-automatic pistols. It has a bullet diameter of 0.355 inches (9mm), a case length of 0.680 inches (17mm), and a rim diameter of 0.374 inches (9.5mm).

ACP stands for Automatic Colt Pistol and refers specifically to the .45 ACP cartridge, also designed by John Browning. The .45 ACP cartridge has a bullet diameter of 0.451 inches (11.43mm), a case length of 0.898 inches (22.81mm), and a rim diameter of 0.480 inches (12.2mm).

Therefore, .380 Auto and .45 ACP are distinct cartridges with different dimensions and performance characteristics.