I asked around a bit. Folks weren't sure if a BLR barrel would be a good one for a rebore. They are set up different than say a M700. Aluminum receiver, with the bolt locking into lugs that are part of the barrel. I think.
But other than THAT- hell yeah! I already know how well I like the rifle as a .325 for timber elk- which is to say a LOT- so it would only be better as a .358 WSM.
At least, recoil aside. I have to think that 250's at 2800 fps are getting a bit... chippy?
