Out of my Glock 23 using Power Pistol, CCI SP primers:
8.0gr PP: 1166fps, ES 35fps, 423 ft-lbs
7.7gr PP: 1109fps, ES 33fps, 423 ft-lbs
I've chosen to stick with the 7.7gr. Don't like pushing 40S&W reloads hard out of a Glock. As a point of reference, factory ammo:
155gr Speer Gold Dots: 1140fps
155gr Silver Tips: 1117fps
155gr Federal HST: 1150fps
I see no reason to ever go above 8.0 and prefer 7.7gr PP
If you prefer a less flash powder, I'm working on a load using True Blue (one of my new favorite powders).
7.5gr TB: 1052fps, ES 40fps, 382 ft-lbs
Note: Ramshot does not publish data for a 155gr 40S&W, my load was an extrapolation from the 150gr data they provide. Work up carefully should you choose to use it, as neither I or The High Road are responsible for any Kabooms.