The reason you don't have to resize a neck after inertial bullet pulling, as some here have discovered, is because neck tension is separate and different from excess interference fit.
That bullet you need to pull had expanded the neck when it was seated. It's held in place by the neck's springback force, which is ~1thou (max). When you pull the bullet, that neck will spring back ~1thou (max). Now you seat a new or same bullet in that neck and it expands ~1thou, right back where it was before pulling a bullet. NO CHANGE. With this, 1thou is all the interference fit needed, as further downsizing will get you no more tension (only greater seating forces -while using a bullet to upsize).