Nomercy - that's very interesting. So let me see if I understand this. Because if I were to go about my usual method of loading various charges and shooting for group, I would have settled on #8 and been fat dumb and happy.
So they way I understand what you're saying is that I should concentrate on loads 5-7 and play with seating depth. This should give me tighter groups (tighter than #8)?
Why not tinker with seating depth with the charge from group 8 first?