The new Winchesters are the pre64 action that is pillar bedded. I don't know why the smith wants to bed the whole action, it usually isn't necessary. When bedding my guns I bed the tang, the recoil lug and the the chamber up to the first 2" of the barrel past the chamber. Depending on the stock I will either install some shims to pre float the barrel while bedding or open up the barrel channel. Perhaps some of the career smiths on here like Stalking Bear or Big Bulls who may have some experience with the FN made Winchesters will have better input.