On this whole how close you can read a beam scale question....I think that it can be argued that when loading for long range that tuning to even tenths of a grain is close enough, BUT that if you are loading 43.4 grains, that only being able to read the scale to .1 is not good enough. You need to know that your extreme spread of weights is within a much smaller range than +-.1, and while the scale on a balance bean scale would be difficult to manufacture with small enough graduations to be able to read to .02, all you really need to be able to do is see that a given quantity of powder that is being weighed falls within the acceptable range.
If you have a scale that will register the addition of one granule of powder, you can simply note the beam deflection for each additional piece, and from that you will have a pretty good idea of how close you are to your desired weight. With a web cam and computer the differences are easy to see, and if it is the width of a line, or half that that you are trying to stay within, it can be seen. That there are no numbers to show these fifths of tenths is not very important. It is like using a gauge. As long as the length of a part is longer than or equal to the minimum, and shorter or equal to the maximum, the part is within tolerance, no numbers needed. I have noticed that sometimes, when we have the ability to resolve to a finer degree than is needed for a particular application, the numbers can take on a life of their own, beyond any practical reason. Even if I had the budget to buy an expensive magnetic force restoration scale, it would do me little good because I would not risk taking it to the range. On the other hand, a tuned balance in a wind box travels well for those few occasions that I need it.