I have settled on 6.6 gr WSF + 165 gr plated 0.400" FN (HSM/IQMetals) which gives about 1,050 fps in my Ruger SR40. The load burns very clean -- very little residue & clean cases. In my SAR B6P Compact 9mm & GLock 17 I use 5.1 gr WSF + 124 gr 0.355" RN plated (Everglades) for about 1,065 fps, but in the 9 I get a noticeable amount of fouling -- not bad, but more, relative to the 40 S&W. The powder loads are fairly bulky, making an accidental double-charge impossible (FWIW, my loading procedure largley eliminates that possibility anyhow).