Re: Build on Vangaurd?
I had a 257 Weatherby built on one. I used a Brux# 4 Contour and a B&C Medaist Stock. It fit perfect with the Brux #4. The gun is incredibly accurate. I couldn't be happier and would have zero reservations about about building another.
As others have said, be sure to check with your smith, as some will not build on them due to the metric threading.