It doesn't matter if your scales read differently as long as they read consistently.
As long as the scale you are using for load development is consistent then you will be safe.
Jack O'Connor published some pretty hot loads for the 270 Winchester. It wasn't until after a friend of his got his reloading scale after Jack's death did anyone figure out that Jack's scale read about a few grains high consistently.
Jimro
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Machine guns are awesome until you have to carry one.
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