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I think the 8.3 inch test barrel is the issue. My Nosler number 3 has the same data as you listed. SPEER tested with a 6 inch security six. Speer number 11 lists 296 at 17.8 max for 158 grain. It lists 15.9 max for 2400. But again a revolver and a closed breech test barrel are not the same test.
Just so you know I would never load a max load for anything unless I had worked up to it. Reloading data from any single source is worthless in my experience.
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