My first piece of advice is to make sure that the data you are using is for the powder you have, since some companies use the same number as another company for a somewhat different powder (just different enough that the data is not interchangable).
4350 is particularly bad in that respect (3 companies at least) but also 4064, 4831 and 4895 need to be double checked. And those are just from the Lee manual.
The second piece of advice is to be the type of person who learns by reading. And get several different manuals and compare them.
