From working with that round in a few rifles, I'd add this to John's advice:
-Make sure you remove the fired primers when using the Hornady tool. Leaving fired primers in place skews the measurements a few thou.
-Don't worry too much about the measurements until you fire them 2-3 times with a stout load. The light loads that factory ammo has won't blow the case out enough to fully form to the chamber.
-Run....don't walk...away from the Lee dies. The Redding #80322 and RCBS are both great dies for this chamber. If you go with Redding, opting the carbide expander ball # 48256 is worth the extra in terms of not having to inside lube the necks.
Hope this helps. -Al
