260 Youth Loads?

[Propdoc03]

Hope this is appropriate for this site, dont know where else to ask? I am looking for some youth load data for a Model 7 260REM. I am working with Hornady 129SSTs and Sierra 120 Spire Points.
I have H-4831SC, IMR-4064, IMR-4350, VV N550 and N540 for powder. Any suggestion on what might be the best combo or starting place?

Thanks,
Dennis

 

[KRP]

I shoot the 129SSTs and ~43 grains of IMR 4350 out of my 260.