Me, I use 5gn of WSF( Winchester Super Field) powder behind 9mm 124gn RN projectiles.
For fiocchi cases which are said to have smaller volume, I use 4.7 gn of WSF.
Time for you to get hold of some loading manuals which have data for powders inside.
Look for ADI (which you can also find as a PDF online) Winchester, Hodgdon, Alliant, Vihtavouri. IMR
ADI will no doubt be the easiest cheapest pistol powder to get hold of.
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