It is kind of odd I was discussing this on another forum today. I posted some screen shots from quick load and exbal to illistrate a point. I have not read this entire thread, but here are the screen shot take them for what they are worth. Note that I gave the 257 weatherby 50 fps above what QL predicted by accident.

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The weatherby wins by a small amount in elevation, but the important thing, windage goes to the .264 by a small margin.