.338 Winchester Collet Neck Sizing Die by Lee Precision (91023)

Description

This is the Lee Precision Collet Neck Sizing Die chambered for .338 Winchester Magnum, sold as a single die. Instead of using an expander ball that drags through the neck like a conventional sizer, this one uses a steel collet to squeeze the case neck against a hardened precision mandrel. The result is a neck that's sized straight and even, with very low runout and consistent bullet grip from case to case. If you're chasing accuracy out of a bolt gun, that consistency is where the gains come from.

What Sets the .338 Win Mag Collet Die Apart

The big draw here is that neck sizing only works the neck, leaving the rest of the fire-formed case alone. Since the brass isn't being squeezed down and stretched back out on every cycle, it fatigues a lot slower. Many reloaders see their brass last several times longer than it would with full-length sizing, and you won't be trimming anywhere near as often. One more bonus: there's no case lube required, since the die only presses the neck against the mandrel. That keeps your brass clean and skips a messy step.

Getting the Most From This Lee Collet Neck Sizing Die

This die is built for brass that's been fired in your rifle and is going right back into that same chamber. Because it preserves the fire-formed fit, it's meant for bolt action and single shot rifles, not autoloaders or lever guns. Neck tension is set by the mandrel diameter, and if you want to fine-tune it, Lee can supply mandrels ground to other sizes. Uniform neck wall thickness and annealing go a long way toward getting the most consistent results.

It threads 7/8"-14, so it drops into any standard reloading press. Lee stands behind their collet dies with a smallest-group-or-your-money-back guarantee, which tells you where this tool is aimed. For loading precise .338 Win Mag hunting and target rounds without fighting a tube of case lube, it's a simple, effective piece of kit.