The dippers come with load data. Lee dies come with load data. Lee's manual comes with load data. In most cases, the loads they give are START loads as there is no load work-up.
I wish
The problem is you need a fluffy powder where 0.5cc is still within the safe load range for 9x19.
The problem is that Lee only gives you 0.3, 0.5, and 0.7cc at the low end and so many times you WANT 0.2, 0.4, or 0.6cc.
Let's take a loading example:
For 115gn jacketed bullet in 9x19 (9mm Luger), we want to use Power Pistol. Checking my manuals, I have start loads for 115gn Jacketed bullets ranging from 4.8-6.2gn and MAX loads ranging from 6.3-6.7gn. So, I need a volume that is less than 6.3gn, and best if it was closer to 5.0gn. According to Lee's chart (where I find that my powders don't pack as tight as Lee thinks they do), the 0.5cc dipper will give me 5.6gn. As you can see, this is below the max load in the manuals I have, but it is close, so Power Pistol "might' be safe.
I will try to attach a snippet out of Lee's #1 manual. The start loads have the following columns:
Start Grains....Volume CC....Auto Disk....Lee Dipper
(but I only show the data to save space)
The Lee Dipper column shows you what dipper to use for that powder (and, for most powders, it is listed as NA for not applicable). So, from that page, you could use the 0.5cc dipper with 3N37, N330, N320, AA7. With Herco, you would use the 0.7cc dipper.
I hope this helps.