I only have the large cylinder. I meters without issue down to about 4 grains. Any lower than that, and the charges begin to vary up to +/-0.3 gr (generally 0.1-0.2).
I do use it for charges as small as 1.8 gr, though. (At these low charge weights, it really helps to be a ball or semi-spherical powder, though.)
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Don't even try it. It's even worse than the internet would lead you to believe.
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