Lyman .40 Smith & Wesson/10mm Auto Carbide 4 Die Set

The Lyman was the originator of the Tungsten Carbide (T-C) sizing die and "Multi" concept with the addition of extra seating screws for pistol die sets. Lyman 7680207 features one piece hardened steel decapping rod and extra seating screws for all popular bullet nose shapes and all steel construction. The Premium Carbide 4-Die Set includes a separate taper crimp die. The 4-Die Sets feature a separate taper crimp die and two-step neck expander M die. The M die improves the accuracy of case and jacketed bullets. Like standard expander button styles, the M die doesn't stretch the case. Working in a two step process, the first step expands the inside of the case neck to just under the bullet diameter. The second step expands the case mouth to bullet diameter or slightly over so that the bullet can be started perfectly centered.