The BT and the V max are both excellent choices. If I were to start with a new 22-250, I'd try those 2, the Sierras, and maybe the Berger.
Now, as to what bullet weight, that'd depend on what kinda shots I took with it. If I used the rifle for any distance, where a 50 yard shot was as likely as a 350 yard shot, I might look at the 40 grain bullets. They shoot very flat.
If most of my shots were at the longer ranges, say, 250 yards +, I would use 55 grain bullets. They hold up against the wind a tiny bit better, and they are a little easier to see strike the ground if you miss.
I know you wouldn't miss, but I do, and it's real frustrating when you know you missed, but you can't tell where you missed.
