Lyman 9mm/.380 ACP/.38 Super/9x23 Winchester Pistol Neck Expanding Must-Have Die

Overview

The Lyman M Neck Expanding Die is designed for 9mm Luger, .380 ACP, and .38 Super cartridges, providing precise neck expansion for improved bullet seating. The die utilizes a two-step expander plug: the first step expands the inside of the case neck to just under bullet diameter to ensure consistent neck tension, while the second step flares the case mouth to bullet diameter or slightly larger to help the bullet sit upright and centered. This process helps prevent shaving of copper jackets and maintains consistent chambering. Constructed from polished hardened steel, this die is built for durability and is compatible with standard 7/8 inch x 14 TPI reloading presses. Its two-step design is intended to minimize brass stretching compared to standard expander button dies, which can extend the service life of the brass.

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