I've been running a 230 grain lead RN over 5.0 grains of HP-38 for awhile now. Gives me 650ish out of my FNP-45 Tactical. Quiet, sorta clean and I never loose my dot when firing. Did up some 9mm last night. Book called for 5.1 grains under a 115 FMJ to get around 1160 from a 4" barrel. I just kept my measure settings the same and ran 5.0. Hoping this would run my comped 509T. I'm impressed! Got 1260 out of the 4.5" 509T. 4.7" M17 averaged 1210, 3" Hellcat about 1120 and P365 the same. No pressure signs, brass ejected well and fairly clean too. Not sure why the drop in FPS from 4.5 to 4.7 though. Each charge was trickled. My chrono isn't syncing with my Note 20, so I didn't see any SD's to compare. No worries. Good range day. 25 yard zero on Pew Pew Poo too.