I too am putting together a 22-250AI but i want to shoot lighter bullets fast.
I therefore have ordered a 14 twist fluted senderro profile barrel from Lilja so i can drive 50-55grn bullets at 4000fps +.
Action is a Stiller Predator and this will be pillar bedded into a Mcmillan Marksman stock.
I also have a Vais muzzle brake
so i can keep my sight picture during recoil and observe bullet impact.
Scope will be a 6.5-20x50 Leupold with side focus.
I am still currently re-building my lathe so i hope to be shooting this project in the early spring.