I feel the argument Dan Newbery makes for preferring a OCW round robin over the Audette Ladder are convincing. The example you linked to with the 20 targets is textbook; how the author draws the conclusion that a node is indicated by targets 14-18 escapes me. All I'm seeing is statistical noise. The value of either method is dependent to a large extent on having the change in POI with powder charge variations dominant over spread due to the inherent accuracy of the rifle/load/shooter combination across the range of powder weights being tried. Without this it becomes difficult to pull anything meaningful out of the exercise and at the same time the value of trying to locate a node is then also questionable. A OCW round robin is better in this regard than a ladder.
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