"What rifle would you suggest for that round?"
Sorry for the delay in reply. Either the Remington or Winchester actions are suitable for the task. If I was building a prone rifle that I wanted to be competitive at the long line I might consider a single shot action like the Nesika Bay but an action like that costs big money. A fella can find long Remchester actions anywhere for just a few hundred bucks. Any of the big name barrel maker's products perform well and choosing a barrel is mostly a matter of personal opinion. Kreiger, Shilen, Hart, etc all make a fine tube. Iron sights are more reliable and cheaper than scopes but if hunting is in the plan a decent scope will have to be acquired.
Hey thanks. I have no experience with the 6.5 round at all.
I really don't even know what it is exactly.
I've been looking at remington barrels, but I don't know what twist would be more desirable for the long line.
Can you even see the target - not hunting - at 600+ without a scope?