A shorter list would be; Who don't.
I'm on that list. I've owned a couple. The last was an action I had rebarreled that didn't work out. I haven't gone back to the well. I wouldn't mind doing it again with the right rifle BUT at the same time, for anything I perceive a 6.5 PRC or .270 being inadequate for, I don't want a 7mm mag, I want a .300 mag with 200 grain bullets minimum and preferably a .338 or .375.
That said, if the right 7mm mag did walk by at the right price, I'd grab it. Screw logic.
Tom