I have a Kimber 270WSM. I think elk at 600 yards is a fair distance for it the way it is set up.
How far do you plan to shoot?
If I were to change it I think a 7wsm with a longer barrel and a brake would be a good deal(I've had 3 270WSM's and 2 7mmWSM's and a 7mmRSAUM).
Just curious, why would you build/buy a 7 WSM versus a 7 mmRSAUM? I'm getting close to a build and been wrestling with this for the last month....
herbdan08