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New brass, even the nicely packaged stuff, rarely shows up perfect. Case necks pick up dents and tight spots in shipping, and necks often run a hair undersized out of the box. The L.E. Wilson Expanding Mandrel Die in .270 caliber (.276) fixes that in one quick pass, smoothing out the neck and setting a uniform inner diameter before you ever seat a bullet. It expands the neck to just under bullet diameter, which accounts for brass spring-back and leaves you with clean, repeatable neck tension.
Consistent neck tension is one of the biggest drivers of consistent velocity, and that is exactly what this die is built to deliver. Unlike a traditional expander ball that sizes the neck down then drags it back up, a mandrel works the brass from the inside in a single motion. That tends to keep runout lower and treats the brass gentler. For folks loading fresh brass for its first firing, this is the kind of prep step that quietly tightens up your groups and shrinks your ES and SD numbers.
The die body is machined from stainless steel for a long service life, and it carries a cutout window so you can see the case align and dial in your depth setting. It threads into any standard 7/8-14 reloading press, so it drops right into the setup you already run. Each die ships with one caliber-specific mandrel and a lock ring, and additional mandrels are available if you want to fine-tune tension or neck up brass from a smaller caliber down the road.
This is a tool for reloaders who want their ammo to perform the same shot after shot. Whether you are prepping a batch of premium brass or just want to straighten necks before that first load, the Wilson Expanding Mandrel Die handles it cleanly. Pair it with your calipers to measure neck diameter before and after, and you will see just how much more uniform your cases become.
It runs a mandrel down into the case neck to iron out dents and set a uniform inner diameter. The neck is expanded to just under bullet diameter, which accounts for brass spring-back and leaves consistent neck tension. The result is more uniform bullet seating and better shot-to-shot consistency, especially on new brass being loaded for the first time.
Yes. The die is built with standard 7/8-14 threads, so it works in any common reloading press. It drops right into the setup most reloaders already run.
It ships with one caliber-specific mandrel for .270 (.276) along with a lock ring. If you want to fine-tune neck tension or neck up brass from a smaller caliber, additional mandrels are sold separately. The die body itself stays the same and you just swap the mandrel.
A mandrel expands the neck from the inside in one motion, rather than sizing it down and dragging it back up the way an expander ball does. That generally works the brass less and keeps neck runout lower. Many reloaders find it gives more consistent neck tension, which helps with velocity spread and accuracy.
| UPC | 815145028426 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | EXP-270MD |
| Shipping Weight | 0.5 |
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