The trick to the lee scale is to put the beam on the base the exact same way every time. I will take it and put it on, then move it all the way to one side, and then back untill its in the right spot... its harder to explain then to do... Look closly at the underside of the beam and the slot where it fits in the base, Its basicaly a blade the fits down into a slot, and if you're not careful on how you do it, you can get it in different each time, and get inconsistent readings. Once you figure it out, its very accurate, I trust it more than my digital frankford arsenal scale, which I got just as a backup to verify the lee scale. I thought it as off since it showed the powder drops from my auto disk as much lower than the chart said they were, but of course I have since learned that the drops from the auto disk are ALWAYS lower than the chart says they are
