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.
  
	 
 
		 
 
		 
 
		 
 
		 
	 
 
		 
 
		 
 
		 
			 
			 
			 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		