I already have an ar-10 in 6.5 creedmoor and 30-06 bolt. I have an opportunity to purchase a 270 x-bolt, fair scope and sling for $600. Not a steal but a fair deal. What does the 270 do that a creedmoor or 30-06 or 308 or Grendel can’t do. Or should I say where does the 270 excel over the others?