L_Killkenny says:
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You need to shoot 3 or 4 groups (3, 4 or 5 shots each) of each load at different targets. That means 10-20 rounds for each load.
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Why not shoot all 20 or more shots of the same load on one target?
If you shoot 3 or 4 few-shot groups on their own target, a composite of all those groups will be bigger than the largest few-shot one.