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The .38 ACP (Automatic Colt Pistol) also known as the .38 Auto was introduced at the turn of the 20th century for the John Browning-designed Colt M1900. It was first used in Colt's Model 1897 prototype, which he did not produce. The metric designation for the round is 9×23mmSR (SR—Semi Rimmed) (not to be confused with the modern 9×23mm Winchester or the .380 ACP).

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  1. Rudedog

    Reloading .45 ACP

    Ideas for cost efficient .45 ACP. These would be for future use as practice ammo for my Sig P220. I have gotten great accuracy from the p220 and 230 grain loads. I have been using Berry's plated bullets.
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