I just don't buy the argument that you cannot or should not try to resize a case neck that is .006-.010 bigger than what you want to size it to with a bushing die. I have read time after time you should only go in .003 increments, and if you go more you will have runout problems. So if you had a neck .006 larger than what it would be finished you would have to size twice to get it there. Which would be another time consuming task. Redding says their bushing dies are round and consistent. I don't think its asking too much that if you have a case that has 0 or .001 runout after firing, to be at or maybe .001 off after putting it thru a bushing die. My experience with them has been 0 runout on fired cases to .005-,006 runout after sizing in their bushing dies. I know others swear by them, but me and many others do not. Barlow