The WSM case is .555" at the web, the SAUM's are .550", and the PRC is .532", I'm going to say, as for 700 actions, you need to start with a regular magnum action to feed the PRC from a BDL bottom metal set up, as will a WSM/SAUM needs to begin with the larger action or open up the feed rails to accommodate the bigger cases.
Detachable bottom metal changes things though.......
