You should be able to get 3000+ fps out of a 22" barrel with 140 grainers no problem. I get 3120 with my favorite 140 grain load with a 23" barrel without pushing it. There is probably a little more there but I have been happy with that load.
I have run 3075-3150 out the the standard .280 with 139s/140s for years in a 24" bbl. Clearly, I could get a little more with an AI, but like other's have said...not dissin' the AI, just doesn't trip my trigger. I like the .280, or the 7MMRM if I want more...which I really don't.
