Question: is .45 acp and auto the same?
Answer: Other Names for 45 ACP 45 ACP/. 45 Auto is also known in Europe by its metric name 11.43×23 mm, in France specifically as the 11 mm 43, and in Argentina as the 11.25 mm. ... So, not only is 45 ACP vs. 45 Auto the same exact cartridge, it's also the same as 11.43x23mm or 11mm 43, or 11.25mm.