Yup. That's the rule. You creep up the charge until extraction just starts to get sticky, then back the charge weight down 5%.
Sticky extraction means the steel in the cylinder is stretching past the elastic limit of the less elastic brass. When it returns to shape it squeezes down on the stretched brass. Even though the cylinder steel survived this, it indicates you are stretching it enough to shorten its life by fatiguing it more rapidly than normal, plus it leaves you no headroom for charge weight error by your powder measure.
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