Assuming this is Norma 203-B powder, it is Alliant Reloder 15 in a different bottle and with a new name. At $18 / lb you have a bargain there! Excellent powder, as long as you don't need extreme temperature stability.
Norma Reloading Manual #2 shows the 120gn Hornady SP as 41.0gn Min and 43.5gn Max the latter for 3,048 fps 2.776" COAL
Its next heaviest bullet is the 139gn Hornady SP where Min / Max charges are 39.0 / 41.1gn for 2.838 fps max load. 2.795" COAL
24 - inch barrel; Norma case; Winchester WLRM magnum primer; max pressure loaded to 60,190 psi using CIP measuring methods which are a little different from US SAAMI.
There are plenty of Re15 loads data around which you can also use.