Have one in 7mm WSM, great rifle accurate and light weight power house. Factory loads chronograph out to advertised velocity and are accurate. So far have not been able to match that velocity with handloads. Don't worry about 270 WSM brass, it is a necked down 300 WSM which is popular, can be necked down/shoulder reformed to 270 WSM. The 7mm WSM is the problem child since it is not based on the 300 WSM case, and not a popular cartridge.
The rifle itself is based on the short action BLR (light receiver) with a standard contour 22 inch barrel, about a half pound lighter than a long action 270 Winchester, and more than a pound lighter and shorter than a 7MM Rem magnum BLR.
I have model 70 .270 WSM. Shoots into 1/2 inch at a hundred with bad eyes. Shoots as flat as a pancake and will smoke anything including elk' just listen to Jack O'Conner. One of the Best rounds I ever had.- Locoman