I just changed out a barrel using the action vice you describe. Of course I had to remove the scope and base first but to my surprise I found the front two base screws loose despite having used loctite during assembly. So there is some benefit to have to disassemble everything, it provides an opportunity to do a thorough review of my materials, methods and procedures, and in this case they were insufficient.

BTW: I use a 6 inch heavy bench vice and 24 inch breaker bar on the barrel nut. Comes in handy as Savage apparently employs a part time gorilla on the assembly line.