While Hodgdon may not have data for a 124 gr, they DO have data for 125 gr.
One grain isn't going to make a difference, but bullet profile will.
Bullet Weight (Gr.) …Manufacturer …..Powder …Bullet Diam. C.O.L. ..Grs….Vel. (ft/s)….Pressure …….Grs. ….Vel. (ft/s)…. Pressure
125 GR. LCN ……...…Winchester ……...231 ……….356" …....….1.125" ..3.9….1009 ………25,700 CUP…....4.4……1086…….31,200 CUP
125 GR. SIE FMJ …..Winchester ……...231 ……….355" …….....1.090" ..4.4….1009…….…24,600 CUP…....4.8……1088…….28,800 CUP