Johnnyj, I personally like the low ES of the -.028 to - .031 groups.
It has the same vertical extreme spread range as the 19-22 groups with better ES numbers if I count your grids right and give no discount for flyer or group orientation. A 9 is a 9 even if your others are 10's. That is why I place more emphasis personaly on the lower ES of the 28-31 range vs the 19-22.
I would clean the barrel , shoot a few foulers, load to .030 to split the depth range and load three groups a tenth apart powder wise and compare those. I believe you will find a node their for powder AND a seating depth range with low ES for the longer diatances!
Anneal before you size the brass for the next test as well.
What length barrel?
It has the same vertical extreme spread range as the 19-22 groups with better ES numbers if I count your grids right and give no discount for flyer or group orientation. A 9 is a 9 even if your others are 10's. That is why I place more emphasis personaly on the lower ES of the 28-31 range vs the 19-22.
I would clean the barrel , shoot a few foulers, load to .030 to split the depth range and load three groups a tenth apart powder wise and compare those. I believe you will find a node their for powder AND a seating depth range with low ES for the longer diatances!
Anneal before you size the brass for the next test as well.
What length barrel?