I "made" a barrel vice by taking ≈4" chunk of a youth ball bat, drilling a hole length wise and cutting it in half length wise. I put it in the pipe jaws of a large Wilton bench vise. It worked okay. I used some rosin to mitigate slipping.
Now I'm playing with a switch barrel and I have to remove the scope mount to use my conventional Wheeler action wrench. I suppose I could notch it, but the rear entry action wrench seems like a slick solution.
I asked NSS if their BAT rear entry wrench would work on a Savage, via E-mail and got terse "no, it won't" answer.