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37grs looks more promising to me…you have only .25″ – .5″ vertical dispersion on a 3 shot group.
Depending on what the setting depth was for the loads you tested…TRY reducing your setting depth with 37grs by .010 increments…if the groups tighten up you are going in the right direction. If it opens move closer to the lands by .010 increments…
I'd continue to add powder in .5gr increments…you may find another node between 39-42grs…Max charge weight is around 45grs so you have alot of room to play yet. Then play with setting depth.
