So I picked up a 6.5 Grendel in Ruger Ranch. 123gr SST & 129gr Hornady Interlock on the loading shelf I’ve got lots of different powders but not TAC or XBR which seem to fit best.

What burn rate would work best? Looking like 3031, 4064, RL15, Varget might do ok but would enjoy opinions. It’s a new round to me that I hope to start my daughter on and I don’t know it’s sweet spot for this bullet weight

Done quite a bit of research but haven’t found any conclusive info

Thanks!