Originally Posted by foggybottombob
Just to kind of complete this discussion, do you use an expander ball when running precision neck sizing dies? If so what is the typical difference in size between the "sized" neck and that same neck after it is expanded. I read somewhere that an expander was typically .025" under size of the caliber. I have no idea if that is correct since I have never checked it.
I personally don't use an expander ball on any of my dies. You will get many different opinions on this as well. I have gotten better and more consistent accuracy since I switched.