I have data from Cutting Edge Bullets for their 240 grain raptors showing a max load for power pistol being 18.9 grains @ 58000 psi with a M.V. of 1761 fps from a 7.5 inch barrel also from load data .com showing max load of 18.0 with aM.V. of 1569 fps, no pressure data but a caution that this is for a freedom arms model 83. I went up to 18.5 and had no pressure signs but lost the accuracy I was after.So I'll stick with 18.0