Oops! Sorry!! If I'd have read your initial thread regarding Valkyrie I would have known better. My bad
Seeing as nothin' is on TV and its dark outside and I can't afford any night vision stuff I did some personal analysis. Nothing scientific. More or less from experiences and IIN (Inverse Italian Notation
Ok, we're going for the most consistent smallest group practicable. Good Deal.
When I have results as shown on your target I do the following:
The 45 gr group shows a strong horizontal component.
The 45.5 gr group show a strong vertical component.
I have found, usually, that success falls somewhere between those two powder charges.
This validated, in my book
, by the 45.2 gr load which produced a very symmetrical group.
As we are usually limited by 0.10 grain increments, I'd load 3 each @ 45, 45.1, 45.2 and 45.3 and shoot them round robin again.
It may be revealing?
If more promise is shown with one of these loads I'd then start tweaking seating depth.
I'd recommend that you retain your practice of using fouler shots!
From your target it may well be that the 45.7 and 46.0 grain charges are headed for another higher velocity node??
Another thing that I've found is that when you get that "special" powder weight it may not produce the lowest ES and SD but will under varied temperatures an atmospheric conditions produce the smallest groups. More times that not I've found this to be the case. Chasing low ES/SD is a whole 'nother story.
Note that group sizes are for comparison only as they were measured using the same assumptions for all groups.
Good luck and good shooting.....