Here's some trivia for you. Lots of folk call it an Audette, or Ladder Test, or Audette Ladder. And Creighton Audette gets credit for the load development method...but he didn't invent it and actually called it the "20 shot method"! It was shared with him by a benchrest shooting friend in California.
I have used it and variations of it. I found much more predictable results by firing three or more rounds of each charge rather than a single round per charge.
If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land. 2 Chronicles 7:14
I’ve refined the method by making my own “shoot n see” targets. I can see the impacts at 600 yards through my rifle scope
I've gotten away from the shoot and see targets. Mostly a time thing. Bought a target vision camera seems quicker. That's pretty much what I'm still using. I did use garbage bag targets for a number of years .And the box test ... A box with thrown powder charges. Very successfully. In 2016 I won a 1000 yard silhouette BR match shooting against 170 others. That day my 300 SAUM Boots Obermeyer and me could not be beat.
Yessir Alan! Many around here have tried the Sattrrlee deal by watching the chronograph and haven’t had as much luck as the Audette.
One shot of each charge level over the chrono is highly suspect.
If one were so inclined, five or even ten shots at each charge level could be recorded. Find the average velocity at each charge weight. Then plot those averages vs the charge weights. If there really are flat spots in the charge vs velocity relationship this will identify them. My belief is these flat spots will go away under such scrutiny.
"In the real world, think of the 6.5 Creedmoor as the modernized/standardized/optimized version of the 6.5x55/.260." John Barsness 2019