The Redding Premium Handgun 3 die sets feature a Titanium Carbide-sizing die and an expander die containing the unique Redding expander plug now coated in TiN, Titanium Nitride for added surface hardness, lubricity and durability. The TiN coating will also reduce brass build up on the expander as well, an important improvement for high volume reloaders. What makes the Redding Expander unique is the series of processes it provides as it travels into the case itself. First a radius on its base eases entry into the case mouth. Next a parallel expander section expands and true's the case internally to create a perfect bearing surface for the bullet as it is seated. This also adds a more uniform bullet pull and start pressure as well. Next is a small step, to properly align the bullet with the centerline of the cartridge case. This positions the bullet for proper contact with the seating micrometer, adding uniformity during actual seating process. Lastly, a flare is the final ste...