![star pistol in 38 acp star pistol in 38 acp](https://s3.amazonaws.com/mgm-content/sites/armslist/uploads/posts/2020/02/22/11232870_02_star_model_as_9mm_largo_38acp_640.jpg)
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Subsequent commercial loadings varied considerably in power. However, these ballistics proved too violent for the Colt Model 1900 pistol, and velocities were soon lowered to below 1,200 ft/s (370 m/s). Reported ballistics for the first commercial loads were a 130-grain bullet at 1,260 ft/s (380 m/s), and some experimental loads ran as high as 1,350 ft/s (410 m/s). Initial loadings of this cartridge were quite powerful. The metric designation for the round is 9×23mmSR (SR-Semi Rimmed) (not to be confused with the modern 9×23mm Winchester or the. It had first been used in his Model 1897 prototype, which Colt did not produce. 38 Auto was introduced at the turn of the 20th century for the Browning designed Colt M1900. 38 ACP ( Automatic Colt Pistol) also known as the.