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Quite a few published loads have a four grain spread between minimum and maximum listed, so max = min + 4.
If my load was min + 2 or less, I would feel safe to run with it.
If my load were above this, I would shoot min, min + 1, min + 2, then advance in half grain increments.
Obviously this needs to be adjusted in proportion depending on the spread of your particular cartridge/powder/primer/projectile combination, published data and any previously determined maximum for your rifle.
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