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Originally posted by Stonecreek:

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Originally posted by Boss Hoss: All of my rifles shoot 15 fps or less deviations so I would say this works.

Even absolutely, precisely matching powder charge weights (the kind that can only be measured accurately on a good balance beam scale) cannot guarantee velocity spreads of less than 15 fps from "all of my rifles". It is in the nature of many powders to produce much larger spreads than this regardless of how they are measured.