Interestingly, the 7mm Weatherby tops out at 3197 in the same manual.
I think it has about the same physical case capacity gain over the 7RM as does the 280 over the AI...indicating pressure differences are the issue, as 3-4 grains in a slightly larger case does not net that much. The representative RL25 loads show a spread of 6 grains...
Would suspect same for the AI vs 7RM comparison with the 160s.
The 7RM to the 280AI is a DD to D-cup comparison, both impressive but noticeable differences are perceivable.
The AI may not have much over the 280 or the 270 but if long was my concern, Nosler makes brass...
FWIW...
