I see many claims of 280AIs pushing 3000fps or more with 168's. I've run two popular powders through mine, and at max book loads I'm getting low 2800's with 168 VLDs. 24" Barrel, 9:1 twist.
H4831SC - 58.0 MAX, 2814fps
IMR 7828 - 57.2 MAX, 2832fps
While my personal deal is that I won't ever exceed book loads, it is worth noting that I worked up to these MAX loads and while I wasn't seeing screaming pressure signs, there were definitely signs relative to starting and mid range loads. Basically, I'm not buying the "book maxes are lawyer driven with a huge margin of error" arguments.
I would be interested in hearing your no BS, chrony and/or drop verified velocities in 280AI using any bullet design and weight. And if you are sporting a 38" barrel or something, or getting 2 reloads before you can fit your pinky in the primer pocket, drop that in as well