Lee Precision Decapping Mandrel .275 for 270 Winchester

Lee Precision Decap Mandrel .275" – 270 Winchester

The Lee Precision Decap Mandrel is the decapping mandrel for Lee collet neck sizing dies: it is the component against which the collet fingers squeeze the case neck and, at the same time, it carries the pin that ejects the spent primer. This .275" version is the one specified by Lee for 270 Winchester and is replaced when the pin bends or the mandrel becomes worn.

In a collet die, the neck is not compressed by an external ring and then reopened by an expander, as in full-length dies: four fingers squeeze it directly against the mandrel, so it is the diameter of the mandrel that determines the final internal measurement of the neck. For this reason, Lee manufactures mandrels .002" to .003" under the nominal bullet diameter: with brass spring-back of .001"–.002", the finished neck remains approximately .001" under bullet diameter, which is the correct tension to hold it. Lee describes this system as capable of producing a precisely aligned neck, reducing runout.

Main features

• Lee designation: DECAP MANDREL .275"
• Mandrel diameter: .275"
• Lee design undersize: .002" to .003" under nominal bullet diameter
• Dual function: internal collet sizing reference and decapping
• Quantity specified by Lee: 1 piece per die
• Calibers indicated by Lee: 270 Winchester

Recommended use

Replacement part for Lee collet sizing dies — Collet Neck Sizing, Micrometer Neck Sizing, and Ultimate Die Set — in 270 Winchester caliber. Lee specifies this as a replacement for the 270 Win Ultimate Die Set (code 90593), the 270 Win Micrometer Neck Sizing Die Set (code 90713), and the 270 Win Neck Sizer (code 90958).

Package contents

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

Manufacturer code: NS2625