Lee Precision Decapping Mandrel .3205 for 8x57 Mauser

Lee Precision Decap Mandrel .3205 – 8x57 Mauser

The Lee Precision Decap Mandrel is the decapping spindle for Lee collet neck sizing dies: it is the element against which the collet fingers squeeze the case neck and, at the same time, it holds the pin that ejects the spent primer. This .3205" version is the one designed for 8x57 Mauser collet dies.

In a collet die, the neck is not compressed by an external ring and then opened by an expander, as in full-length dies: four fingers squeeze it directly against the mandrel, so the diameter of the mandrel determines the final internal measurement of the neck. For this reason, Lee makes the mandrels .002" to .003" below the nominal bullet diameter: with a brass spring-back of .001"–.002", the finished neck remains about .001" below the bullet diameter, which is the correct tension to hold it. The component is described by the official Lee distribution as a steel spare part.

Main features

• Name: Decap Mandrel .3205
• Mandrel diameter: .3205"
• Material: steel
• Lee design undersize: .002" to .003" below nominal bullet diameter
• Dual function: internal collet neck sizing reference and decapping
• Indicated caliber: 8x57 Mauser

Recommended use

Replacement part for Lee Collet Neck Sizing dies in 8x57 Mauser. The mandrel should be replaced when the decapping pin is bent or broken, or when the resulting internal neck diameter no longer matches the expected one.

Package contents

The spare part is supplied individually and includes only the decap mandrel. The die body, collet assembly, and other die components are not included.

Manufacturer code: NS2631