Regarding the WSM; they can be a PIA. I have a 270 WSM, it feeds, but certainly not as smoothly as a case with more taper. Also, you have to regularly bump the shoulder, and die set up can be finicky. Oh yes, brass is pricey WHEN available.
I will not own another WSM.
Regarding barrel contour; when I had my first rebarrel done, I was advised to use a #4 contour (with the same 270 WSM). I can carry it all day, but it's heavier than it should be. I built a 260 Rem and used a #3 and it is much more pleasant to carry, but still has enough mass to shoot well.
My suggestion is (as previously pointed out) to carefully consider how you want to use the rifle. A #4 contour is perfect for some applications, just take your time to plan it out.
