Are you going to move away from 3 shot groups?
I suggest 9 shot or even more - if you end up at 6 shots and the rifle does the same, maybe it's not a flyer, that's just how the rifle shoots.
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I agree with this approach, if for no other reason than to make a final selection from testing various loads against each other.
To my way of thinking, any decisions regarding which load is better needs 5 or 6 shots minimum to determine overall average size of group, otherwise the decision is meaningless, premature, information with only 3 shots.
