If I were going to build a DGR rifle it would be based on the CZ magnum action period end of story.
If I were going to build anything from a 243 to 3380 RUM it would be built on the Model 70 post CRF model. I like the MRC I don't like the fact it is a glorified Ruger in the fact its cast. I know casting and the way they do it is good but I really like machined metal. Peculiar quirk of mine.
If I were going to build a WSM of any sort it would be on the Sako 75 action. I have never had a WSMround feed any smoother then it has thru that action.
Of course I could always save a thousand or more and buy a Kimber 8400 select grade

in 30-06
Those would be my choices