For those of you who want the best in pistol dies consider a Redding Titanium Carbide Set. Titanium carbide has the highest hardness of nay readily available carbide and provides a slick non-galling surface. The price is a little higher but no lubrication is needed and your cases will glide through the sizing die.
The Competition Pro Series Die Sets are designed for use in progressive reloading machines for those seeking the best bullet alignment available. The Handgun Cartridge Competition Set features a Competition Bullet Seater, Titanium Carbide Sizing Die, and Profile Crimp Die (Taper Crimp Die for cartridges that headspace on the case mouth). Traditional cartridge sets feature a Competition Seater, a Redding heat treated Steel Sizing Die (91000 Series) and Profile Crimp Die. No expander is included, as most popular progressive machines expand the case mouth at the powder metering station.
Big Book Catalog, Issue:67, Page:515
Sinclair, Issue:4A, Page:042