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Fresh 25-caliber brass rarely shows up perfect. Necks run a touch undersize, and bulk shipping leaves its share of dents and out-of-round openings. The L.E. Wilson Expanding Mandrel Die fixes that by running a tapered mandrel through the inside of the neck, opening it to a controlled diameter slightly under bullet size. The result is uniform neck tension across your whole batch, which is where consistent seating depth and better accuracy start.
Unlike a bushing that sizes the outside of the neck, this die works from the inside. A lot of precision reloaders prefer that approach because any variation in neck wall thickness gets pushed to the outside rather than affecting the fit on the bullet. Set your interference fit once and every case comes out the same. Wilson sets its standard mandrels around .001" under bullet diameter to account for the natural spring-back of brass, so you get a predictable final dimension without overworking the metal.
The die body and parts are stainless steel, built to hold up through years of use. A window cutout in the body lets you see the case as it enters, which makes setting depth and checking alignment simple. It threads into any standard 7/8-14 reloading press, so it drops right into the setup you already own. A little graphite or neck lube on the inside of the case neck keeps things smooth and extends mandrel life.
This one is built specifically for new brass prep ahead of seating, and it pairs naturally with a Wilson bullet seater for that first loading. It covers 25-caliber cases at the .256" diameter, and because the mandrels are interchangeable, you can swap in other sizes down the road if your reloading grows into more calibers. Proudly made in the USA, it's a straightforward tool that does one job and does it well.
It runs a tapered mandrel through the inside of the case neck to open it up to a diameter just under your bullet size. This sets a consistent internal neck diameter and uniform neck tension across your brass. The payoff is more repeatable seating depth and better shot-to-shot consistency.
Wilson designed it specifically for prepping new brass before the first firing. New cases often come slightly undersize or dented from bulk shipping, and this die cleans that up before you seat bullets. It pairs well with a Wilson bullet seater for that initial loading.
Yes. It threads into any standard 7/8-14 reloading press, so it works with the setup you likely already have on the bench. You'll just need the correct shell holder for your press, which is not included.
A mandrel sizes from the inside, so any variation in neck wall thickness is pushed to the outside rather than affecting the fit on the bullet. Many precision reloaders find this gives more consistent neck tension than setting the outside with a bushing. Running a light coat of graphite or neck lube inside the neck first keeps the operation smooth and extends mandrel life.
| UPC | 815145028419 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | EXP-25MD |
| Shipping Weight | 0.5 |
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