Well, plenty of Remington 700 and Sevens have been chambered in WSM rounds from the factory, and have worked just fine for most.
I'd like to see that statement backed up with...something.
I do not see any of the short mag varieties on the store shelves in my area...nor do I see ammo for them. I did the 7 SAUM in a Rem 700 with the 24" barrel. I liked it. I would have liked it better if It had a 3.00" cartridge overall length capacity.
Uh, maybe you could look up factory chamberings from Remington. They have been produced in WSM chamberings since shortly after the beginning release of the WSMs.
Or, maybe you just want to buy a brand-new 700 in one of the WSM chamberings, see:
Rem700 SPS in WSMOr, used Rem700 in WSMs:
GB Rem 700 300 WSM search, and another for 270WSM
Rem 270WSMOr a brand-new Model Seven in 300WSM, see:
Model Seven Stainless 300WSMAs for historical Sevens in WSM chamberings, they were made in the XCR, Whitetail, and CDL versions that I know of in both 270 and 300 WSM.