Originally Posted by
memilanuk
Since you most likely don't have a custom chamber (given that .346" value), some might argue that neck turning is of *no* value. I would agree it is of perhaps 'less' value, but I think it still helps (or at least sure doesn't hurt) to get a consistent thickness all the way around to help ensure even release of the bullet. Neck clearance in the chamber is *not* a concern in your situation. Take a ball or tubing micrometer, measure some of your cases at three or four spots around the neck to find what the thin spots measure. Set your neck turner to just clean up enough of the neck that you get *most* of the thin spots - 80-90% clean-up is plenty.
In theory it might over-work things... but in practice, I generally lose cases due to loose primer pockets before any concerns with the necks, especially in this modern day-n-age where annealing is more accessible and commonplace.
HTH,
Monte