While not often understood as to why, as long as any scale is repeatable in weight shown for the same item its weighing, it doesn't matter if it's .4937 grain off from perfect and exact with a lab quality check weight. Nobody shoots those check weights. Powders are not that repeatable for the pressure and bullet velocity across all lots it produces for a given component suite. Nor are all lots of primers igniting that powder. Close and safe is good enough.
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