I think 3250-3300 fps is too optimistic for the AI. It’s the right range for a 7 Wby.
My 280 AI runs right at 3200 fps with 140 AB’s using 63 gr N165. That’s as far as I feel pushing it. While that may not be pushing it for the capability of the cartridge, it’s plenty for me. I think a 140 at 3200 is formidable. It’s less than MOA in my gun.
Must add, the 280 AI is great as is. If you want more go with a larger case.
