Speer lists two GD loads for 357 SIG. Load# 53918 at 1350 fps, and load# 54234 at 1375 fps. That's just 25 fps difference, is there a difference in bullet construction? Does any one know which one is used by LE agencies such as the Secret Service and Texas Public Safety? Any info would be appreciated. Thanks, Gus http://le.atk.com/ammunition/speer/handgun/default.aspx Wanna kill these ads? We can help!