Lee Precision EZ X Expander Decapping Die 8x57 Mauser

Lee Precision EZ X Expander 8X57 – 8x57 Mauser

The Lee Precision EZ X Expander is the decapping-expander rod that operates inside Lee full-length sizing dies: in a single press stroke, it extracts the spent primer and expands the case neck to the size required for bullet seating. This version, designated by Lee as EZ X EXP 8X57, is designed for the 8x57 Mauser and 325 WSM and is the replacement to order when the decapping pin bends or breaks, a common occurrence with cases featuring crimped primers.

It is a single steel rod: one end acts as the decapping pin, while the intermediate bulge — the .322" expander ball — internally resizes the neck as the case moves out of the die. The total length declared by Lee is 3.370". In the Lee full-length die exploded view, the rod is held in the die body by the decapper clamp (code SD2151) and the O-ring (code SD2153), both of which are separate replacement parts.

Main features

• Lee designation: EZ X EXP 8X57
• Expander diameter: .322"
• Total length: 3.370"
• Dual function: neck expansion and decapping in a single operation
• Quantity specified by Lee: 1 piece per sizing die
• Calibers specified by Lee: 8x57 Mauser, 325 WSM

Recommended use

Replacement part for Lee full-length sizing dies in 8x57 Mauser and 325 WSM calibers. Lee lists it as a replacement for the 8x57 Mauser RGB set (code 90883). The rod is removed from the die body by loosening the decapper clamp and must be reinstalled while maintaining alignment with the case flash hole.

Package contents

The replacement part is supplied individually and includes only the decapping-expander rod. The die body, decapper clamp (SD2151), and O-ring (SD2153) are not included, as Lee lists them as separate spare parts.

Manufacturer code: SE2324