RWK, it was not confusing, just trying to determine what you were doing. Special order catalogs are available for free, to me most helpful, from 4DC&H and RCBS etc. 1 800 533 5000. The catalog list most combinations of wildcats and improved chambers and the cartridge to use when forming a cartridge for a particular chamber, the forming/trim die is listed when one die can be used to from a case as in 30/06 to 8X57, 7X57 etc., many of the listings indicate 'no formingdie necessary, use the sizer die for a particular chamber' as in 30/06 to 8/06. Having both reamers, chamber and die, is a luxury, as I said before I would not use the die reamer to modify a die as in going from a 243 Winchester (243/08) to a 25 Souper (257/08).
As to being a bit confusing, some of this is not for everyone.., my favorite reamersare the 25/06 AckleyImproved and the 280 Remingtonbut that is another story and again a little confusing.
RCBS sells die blanks.
http://www.quarterbore.net/forums/showthread.php?t=583
F. Guffey