Good advice. That 125gr Sierra FMJ start load will probably be very close to what you need. Make up a few and see how they cycle your gun. :shock:96/44 said:It is generally safe to use data for a heavier bullet with a lighter one. DO check more than one source though, then use the lightest published starting load to work your way up. You might try contacting the bullet manufacturer, or Hodgdon, they are usually very helpful with load info.