I have used that same Lee system for years with no issues, not saying it is the most productive way but it works. I would think measuring from the shoulder may be less accurate because one would be taking for granted that all other measurements from that junction on the shoulder to the base are equal from 1pc to the next. Maybe there is a tool or system for that, I don't know at this time. Trimming is chore that I am never excited to do and as such my higher volume shooters are mostly Ackley Improved chambers which practically eliminates trimming and with the added brass life I use them when practical. But that's another topic Lol.
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