K+M Neck Turning Expanding Mandrel (.35 Cal and larger)

Description

Virgin/competition brass isn’t quite ready to neck turn when you buy it, and the commercial die manufacturers do not have a set standard for the size of the expander button in their dies. Large variations from manufacturer to manufacturer and even within a given manufacturer makes it necessary to properly size the inside diameter before turning. 

The turning pilot cannot be used to correctly expand the case neck because of the elasticity of the brass – it will ‘spring back’ and be too tight for proper neck turning.

The expanding mandrel will iron out (smooth) and slightly expand the case neck so the brass will spring back to the correct size needed to neck turn your brass.

The 7/8-14 Threaded Press Adapter fits your normal reloading press, and the interchangeable mandrels are sized to be the perfect companion to the K+M Neck Turing tool found here.

A Mandrel Holder is required, found here.