Just to mention something that might help you:
If you use a mechanical scale, find a way to lock the scale at the weight that you want to have in your loads. (The little Lee scale has a little lock pin you can use for that purpose).
Set your powder thrower (or dipper, if you are really low-tech) a few tenths of a grain lower than that, so that all your loads need a bit extra.
Drizzle in the extra with a powder trickler until the scale balances. If you don't have a powder trickler (they are cheap) you can use a spare case (without the primer) as a sort of "salt shaker" to shake out powder a few granules at a time (through the primer hole) onto your pan -- until the beam just balances. For example, a .223 case that has been fired can be filled with Varget and a used .22lr shell makes a nice cap that fits inside the neck of the .223 and will keep it from spilling.
On the little lee, experiment a bit to figure out how much higher or lower the beam will be when you are just about 0.1 grain HIGH or LOW. On mine, it is about 1/8 inch. Just a very few sticks of powder make 0.1 grain! If you get to where you can estimate from how the balance is acting, how high or low you are, then you can "salt shake" or drizzle out just about the right amount to get yourself within 0.1 grain.
On my rifle, a little test with several different powder charges showed that on average, a change of 0.1 grain made only a 0.1 inch difference (on average) in shot placement. So it isn't terribly crucial to be EXACTLY right on unless you'e able to control all other errors down to considerably less than 0.5 MOA.
Hope that helps,
gordon