Everyone: I guess at this point I need to update.  Redding wanted to send me a new decapper shaft and pin before I reinstalled the Pro Titanium Sizing Die.   I'm sure my method of checking the EGW/Lee UDie next to the Redding Pro was very unscientific, but it was the best I could come up with at the moment. I took new Starline brass, and measured the top (just below/next to the mouth), middle, and base above the extractor groove. After running through the Lee UDie, the top measure