I have used that method only once, with my Ruger M77 MkII. I know my guns must be weird because I don't see dramatic shifts in groups as charge weight changes, in anything I've ever loaded.
My M77, which is chambered in .204, shot so consistently from bottom to top of the charge range that I didn't even bother to analyze the results. I went to published max and stayed there.
However, Uncle Nick (moderator of this forum) is a big proponent of the Newberry method. He is highly experienced and learned in reloading. He says it works, which is enough for me to recommend it to others.
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