I just have the barrel, I don't have a 700 to go with it. My intentions were to cut 1.2" off and rechamber to 6-284 and put it on a 98 action. However, another 6-284 project is # 37,493 on my list of projects, so it has LOW priority. I don't want to try to get a 98 to feed a WSSM case and if I find a SA 700, I would build a 6.5 something on it.
I think if I sold it now it would be worth more than if I shortened, rethreaded and rechambered it, found out it wasn't what I wanted and sold it then. It looks like the WSSM bests the 6-284 by about 30-90 FPS. I don't know if a 6 RSAUM will give you much more or if you reach the diminishing returns plateau for the 6mm bore.
