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would bet you are loading .280 AI to substantially higher chamber pressure than anything in the books for .280 Remington.
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I'm sure that is the case. I can tell you that the difference in pressure and recoil between one grain when you get on the edge of maximum is quite noticeable.
I use the data in the manual now having lost the need for speed some time ago.
But, 5 or 6 grains to get 70 or 80 FPS must have been a challenge for the writer to find a powder that would do that and substantiate the point he was trying to make before he started the research.