Can one size the neck 3/4 the way down the neck on a fireformed case so the base of the neck centers the case in the chamber even though the chamber is factory? Chamber is .346" Loaded round is .337" Bushing is .334" I finally got my sizer die (Redding S) and figured I could tighen groups up some, but wondered if anyone's done this on a factory chamber before with success? I read the Wilson bushings only size 40% of the neck and it got me thinking. I figured .75"-.100" of neck above the shoulder would give me enough to center the case up good and still leave plenty of support for the bullet. Any thoughts?