There's a few problems with trying to eval this target.
The presence of 5-shot groups pushes a lot of heat into the rifle. I typically discourage this. There is also some noise present. The group at 43.5 has a ton of horizontal stringing which indicates the rifle driver is having some trouble with NPA. If that NPA problem carries over to vertical, then it's not unreasonable to think NPA could be responsible for the vertical shift between the top row and second row of targets. This could be evidenced by the presence of wild fliers 1moa out from group.
Ignoring all else and just looking at the target, it would appear there's something workable around 43.5gr, as the groups on either side are dead level with it. Though as I said, that target has lots of white noise.
OK, i have a new batch loaded up for testing. 3rd fire lapua brass/175 SMK/FL size .002 bump/cases trim to 2.010/.003-.004 neck tension with all having .001 or less runout/43-44 Varget in .2 grain increments/bullets seated COAL of 2.820 which according to my gauges puts me .045 off the lands.
Cleaned with rice.
Once i got my RCBS FL die set right i had .001 or less of runout on all cases, all bullet seating pressures were very similar in feel in fact they all felt identical.
I will be doing the same test, 3 rounds each instead of 5. I have some improvements in my rest system, so if i can do my job i should eliminate most of the "white noise".
How long cool down between shots & how long recommended between the 3 shot strings?