Those are Remington's SJHPs and most any load recipe for 125s should work. Remmie 158s seat a tad deeper to the cannelure than Hornady's 158s so one must accomadate for the difference in case capacity, but I don't know about the 125s. Start low and work your way up and you should be fine.
http://data.hodgdon.com/cartridge_load.asp