Greetings,
Powder measures and stick powders are not the best of friends as you have discovered and trickling up to the exact charge is the usual fix. This is made easier with a proper powder trickler although I have used a Lee dipper and carefully adding the powder with that after dipping most of the charge. As far as how much difference this makes you would need to test in your rifle at long range and chronograph to see how much your velocity varies in your rifle.
GPM.
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