What really matters is consistency, just make sure that your indicated value doesn't change between loading sessions. That way you know when you measure 25gr on your scale it is repeatable, don't get hung up on 0.1gr error, that's plenty accurate for a reloading scale. Your powder measure will throw charges +/- 0.1 - 0.2gr depending on powder choice and you will still have accurate safe ammo. What will really drive you nuts later are different loads from different manuals for the same powder, in addition to watching those loads change over time.
The reccomended powder charges are just that,a reccomended place to start and stop. I have had blown primers before I ever got close to a max charge before,start on the low side and watch for pressure until you find an accurate load.Do not try to magnumize a cartidge,accuracy usually goes out the window,buy a magnum for that.I have also found that around 96% -98%of max is usually where the best accuracy from a rifle happens,YMMV.
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