69 gn sierras, 24.5 gn Varget, load 5 @ .075 off, 5 @ .050 off, 5 @.025 off , 5 @ .005 off. One of those 4 seating depths should give you a .5 group
This would all depend upon his throat length. I'm crunching powder (Varget) at that load using Lapua 69 gr. Scenars seated .010 into the lands of my Criterion match barrel. Can't possibly move it back without losing seat consistency. If the bullet doesn't like being in the lands, I'll have to reduce the charge and settle for a slower node.
I do have good loads for the SMK and TMK however, it's while using 8208XBR. Less crunch and I have to say the SMK and especially the TMK shoot remarkably well out of my barrel. We'll see how the Lapua compares.