First off, congratulations on getting started reloading.
Second, I wouldn't worry about which disk you use, only the amount it drops. If you're going for 4 grains, find what disk drops it and use it.
Third, this is why I suggest everyone, at least eventually, use Dillon reloading equipment. They are the best on the market, bar none, and are absolutely repeatable. The greatest variation I've ever had with my RL550B was 0.3 grains while using IMR 3031, which doesn't measure through anything very consistently due to its cylindrical shape. And that was while dumping 49 grains for .45-70 so it didn't make much difference anyway.
Consistency of movements is key to repeatable loading. Pull the handle with the same speed and force every time and, as you tried, be sure to let the powder drop completly as it doesn't do so instantly.
Good luck!




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