Wyoredman, Looking at my little free give away Winchester reloading components manual. Winchester says 5.5 to 6.2 of WSF with a 230 LRN. FPS of 820 to 910 with pressures of 15,200 to 19,600. I have loaded MANY 1000's of rounds with some old WSL that I have. I am certain that you should be able to duplicate your 231 loads with WSF.