I'm with Burleyboy on the recommendation of doing a Creedmoor or Lapua in 6.5 mm and using the Predator SA

If you are doing the 6.5-06 or 6.5x284 then you will need the 300 action.

I would suggest the Predator because the side bolt release is higher on the action and doesn't require extra inletting to fit into a Remington 700 stock