Thread: Reloading without neck sizing

I came across a description the other day of chamber reamer dimensions at the neck ground to allow fired cases to be reloaded without any sizing whatsoever, something along these lines: the chamber is cut tight enough at the neck - 3/4 to 1 thou over the loaded round diameter - so only elastic expansion of the brass occurs on firing. The brass then springs back perhaps 1.5 thou restoring 1/2- 3/4 thou neck tension for the next reload cycle without any neck sizing. In this way the cases can be reloaded repeatedly without ever needing to neck size. Obviously only suitable when chamber and ammunition cleanliness can be absolutely assured to maintain such small clearances so not suitable for my purposes but an interesting concept. Has anyone tried or heard of this approach please?