CJK8
In the Speer article on "Modern Benchrest Reloading Techniques" the majority of it deals with centering the die body and decaping rod/expander button to increase accuracy and decreasing neck run-out.
The article states that more "INACCURATE" reloaded ammunition is made than "ACCURATE" ammunition because the die body is off center and more importantly the expander button is locked down off center.
The reason I do not like the "feeler gauge method" is because it requires re-centering the die and expander button "EVERY" time you adjust or move the die. This means making and testing dummy rounds for run-out "EVERY" time you move the die.
What fguffey and many of you do not understand is there was a reason the shimming washers and taller shell holders were made and that was to increase accuracy of loaded ammunition and not induce run-out error into your loaded rounds. What angers me is fguffey comments added to the fact he didn't do his home work on these reloading aids or "WHY" they were made in the first place.
The body of the reloading die is "NOT" self centering and the lock ring can pull the die off center and there are important steps in aligning and centering your reloading dies.
1. With the lock ring loose you place a lubed case in the shell holder and raise the ram, this centers the die. Next you lock the lock ring down with the die centered and then release pressure on the press handle and try to rotate the shell holder. If the shell holder binds and will not rotate freely the die body is not yet centered in the press. (the case extractor groove is binding in the shell holder because it is off center)
2. The expander button is centered by leaving the lock ring loose until the button just starts to enter the neck of the case and is "centered" in the neck, then the lock ring is tightened down.
3. Now guess why they make self centering bushing dies that do not have expander buttons.
4. There is nothing wrong with using the feeler gauge method "BUT" it requires the case to be re-centered each and every time you loosen the die lock ring. Using shim washers once the die is setup and centered you "NEVER" have to adjust the die again.
So Mr. fguffey go ahead and tell the world and everyone in it again that I do not know what I'm doing.
Better yet just go to
http://www.accurateshooter.com/ and read the reloading articles written by the experts.
"All the information in the world is written in books and all you have to do is read"