I actually did a couple hours of reading online, at various gunsmithing sites, and found that the std metals for the major actions are all really similar. What hardness they're treated to was a point for conjecture. Remingtons didn't exhibit any 'softness' compared to others. I tried to find anything from Jarrett about 700s being softer. No luck. So I'm going to call Bullshit.
As near as I can tell, the general consensus on Remington 700 CM actions is their Rc value is in the neighborhood of 36 (though the late Frank de Haas claimed a value of approximately 10 points higher), which is about the same as every other well-known mass produced CM rifle action. (Custom actions, such as Stiller, Surgeon, Borden, etc. appear to have slightly higher Rc values.)
This was mostly a rhetorical question to thump Dicky Austin and the usual load of dogshit he posts.