I personally don't use them but I ran onto a vendor at a gun show that told me he exclusively used their powders in his semi auto . He really liked Auto Pistol in the 9mm and 40S&W . I've always been a revolver guy . I have a couple of semi's but they just sit in their case . I haven't really went of a powder search of what I thought was best in my semi auto's . Except in the 357 sig , Accurate #9 is tops in my book for that particular application . If you decide to try it , let us know what you find out .