No experience with that one, but the .243-06 imp. is almost the same thing. I have one in the wings waiting to be put together. I am using a 1-8" twist to allow me to shoot the heavier VLD bullets. I am just finishing up a build in a 6.5-280 30 degree improved case, and this will give you the most capacity out of the .473 rimed case off the top of my head using the .280 case. The .280 Rem case would be less work to form because the shoulder is longer than the .270. The smith's shop that I am allowed to do my work at has been building .243-06 30 deg. for a long time and it is one of his favorite and most accurate catridges. He had his reamer custom made though.
I'm sure if you put one together you would not be dissapointed.