My normal load for 38 spl +P is 5.8 gr of PP under 158 gr plated FP or SWC. From a Mod 67 w/4" bbl that load clocks about 920 fps which is consistent with Doug.38PR's results above. I also load 357 cases with 8.0 gr of PP under the same bullet for -- IIRC -- about 1100 fps from a 686 w/3"bbl. FWIW, the 357 load generates 1400 fps from my Marlin 1894C.

I also use PP under a 148 gr DEWC but I haven't had a chance to chronograph them yet. However, judging from the recoil in both the K and L frames I don't expect them to be much more than 800 fps or so.

One thing I've noticed is PP seems to like a firmer crip than most people use on plated bullets. When I switched to Xtreme bullets I could put a real crimp on things and a lot of the flash and blackening the front of the case went away.

And it meters very well from my Dillon 550.