Currently shooting my stock JP GMR-15 using Berry's 124gr HHP ladder tested in .1 increments of Sport Pistol and 3.7 seemed to be my sweet spot (PF 130-135), WSP, 1.060". Getting ~0.75" in 5 shot groups off a bench at 25yds. Shot a few hundred rounds this week and haven't had a hiccup. Shoots flat and relatively soft for me. Just started shooting PCC early in the year and started w/ my 147gr pistol loads. Those have to be the softest. Then went to 115gr and thought it was bit jumpy on my dot. Will shoot a local match tomorrow and see if I found THE LOAD.