Originally Posted by Petersen
i use the stoney point gauge and the shoulder is set back a few thousandths after the round is fire. (partial full length sizing). if federal brass is thinner i think that is the problem. i have had no problem with the winchester brass and the die hasn't been changed. thanks. tyler
there actually is no such thing as "partial full length sizing" unless you are using a custom die cut that way, which no one would waste the money on.
You either do or do not FL size. Like being pregnant.
What you described is the one and only correct way to FL size.
With FL sizing the only issue is how much you push the shoulder back and you are spot on if you limit it to .002 max.
NS is often a poor excuse for not learning how to set up dies and having ill fitting dies. Eventually, you have to body bump or FL size or throw the brass away, so why not learn how to do it right from the beginning. Proper dies set up correctly, do not cause separations or shorten case life. Old wives tail.
Even the supposed ardent practioners of NS here, use body dies often custom fitted to their chamber. Which essentially means that they are FL sizing only doing it with two steps instead of one.