Stan I use 23.0 grains of 571 which is about 1150 FPS. Chronographed out of my 28" REM 1100 LW 20. I don't know what the pressure is but 1 oz of 7 1/2 shot over a WW20 wad makes for a perfect fold crimp on older Winchester compression formed hulls. I have never used SR7625 so I can't compare. But if you would consider a different powder that works for me and makes very good patterns out of my old Remington. But hell I don't even know if you can even find 571 anymore. So that won't help if you don't have any....