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This is the L.E. Wilson Expanding Mandrel in .33 caliber, sized to .337 for the .33/.338 family of cartridges. Worth clearing up right away: this is the mandrel component by itself, not the full die assembly. It is the interchangeable piece that drops into the Wilson Expanding Mandrel Die body, so if you already run that die in another caliber and want to add .33, this is the part you need. If you are brand new to the system, you will also need the die body to use it.
The job here is simple but it makes a real difference at the bench. Running new brass over an expanding mandrel sets a uniform inner neck diameter before you ever seat a bullet. New cases often show dinged or out of round necks from bulk shipping, and this smooths all of that out. The mandrel expands the neck to just under bullet diameter, which gives you even neck tension case to case. That consistency is what pays off downstream with more repeatable seating depth and tighter velocity numbers.
This mandrel is built for the Wilson Expanding Mandrel Die and works on a standard 7/8-14 reloading press. Since the mandrels are interchangeable by caliber, reloaders who shoot more than one chambering can keep one die body and swap mandrels as needed. A tip from folks who run the system: a little graphite lube inside the case neck before sizing reduces friction, gives you a more consistent result, and extends the life of the mandrel.
Wilson turns these from stainless steel, so you get a durable, corrosion resistant part that holds its dimensions through a lot of brass. It is a precision piece made in the USA, in line with the reputation Wilson has earned with serious handloaders. For anyone chasing consistency on .33 and .338 caliber loads, this is the small detail that quietly tightens up your groups.
This listing is for the expanding mandrel only in .33 caliber (.337). It is the interchangeable piece that goes inside the Wilson Expanding Mandrel Die body. If you do not already own the die body, you will need that separately to put this mandrel to work.
It expands the inside of the case neck to a diameter just under bullet size, which gives you uniform neck tension from case to case. This is especially useful on new brass, which often arrives with dinged or out of round necks from bulk shipping. The payoff is more consistent seating depth and steadier velocities.
The mandrel is designed for the Wilson Expanding Mandrel Die, which threads into a standard 7/8-14 reloading press. Because Wilson builds these mandrels to be interchangeable by caliber, you can keep one die body and swap in this .33 mandrel when you need it.
Apply a light coat of graphite lube inside the case neck before running it over the mandrel. That cuts friction for a smoother, more consistent result and helps the mandrel last longer. It also helps to sort your brass by brand before sizing for the most uniform neck dimensions.
| UPC | 815145028532 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | EXPM-33C |
| Caliber/Gauge | 33 Caliber |
| Shipping Weight | 0.1 |
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