loads for hornady 124gr XTP
Per Hornady Manual 7th edition:
HS-6 starting load 5.1gr(900fps), max load 5.9gr(1050fps), C.O.L. 1.060"
For win231 you might want to start at 3.9gr and max at 4.4gr. This data is for a 125gr Jacketed Hollow Point with a C.O.L. of 1.075. Since it is not the exact bullet you are using(but very close), if you start at min. and work your way up(keeping an eye out for signs of excess pressure), you should be fine. This data is from the Lyman Pistol and Revolver Handbook Third Edition. Hope this helps. Even better, you can go to Hodgen.com and they list loading data for 231 with a 125gr jacketed hollow point that starts out at a higher load then lyman(almost at lymans max load). Do not go under the recommended C.O.L. as this can increase pressure and generally is not going to help any with accuracy.