You do have a valid scale, right?
I can see using a dipper to get 90% of the load into the scale pan and then using a trickler to finish the measurement.
I can't even imagine a process where the powder was divided with a razor blade.
We recently had a long discussion re: dippers and scales. The considered opinion is that dippers won't throw a precise charge.
For many powders, the difference between a minimum charge and a maximum charge is just 0.5 gr.