Looks to me that 39.5gr is the one it likes. Load it up again and see if you can get repeat grouping. If so then I would play with the seating distance on that load. Have you shot many Factory loads out of the rifle to see what the hand loads are being compared to. I would think over a .25" difference would be the "sweet spot" for me I would start tweaking from there. But the breezy day would have cramped my style for load development day.
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