280AI would be a great option for what you are looking to do. 24" barrel is fine, but I would make sure you are at 1 in 8 twist for heavier projectiles with higher BC and better performance. There is also so good loaded ammo out there if you aren't looking to reload. I have a tikka T3X I built for my son in 6.5 creedmore that is a tack driver. Add one of the aftermarket metal bottom metal to it as well.