These are Wilson Expanding Mandrels Only and are designed to be used with the Wilson Expanding Mandrel Die to precisely set neck diameter on new brass cases. Over recent years, many reloaders have found that new brass often arrives with inconsistent or damaged necks due to bulk shipping.
Running new cases over an expanding mandrel before first firing helps establish uniform neck tension, which directly supports consistent bullet seating depth and improved accuracy. These mandrels expand the neck to a controlled diameter slightly under bullet size without overworking the brass.
Manufactured from stainless steel for long service life, Wilson Expanding Mandrels are interchangeable by caliber and allow reloaders to fine-tune neck tension based on their specific load requirements.
Includes one mandrel.
Additional mandrels sold separately.
What are expanding mandrels used for?
Expanding mandrels are used to set a consistent internal neck diameter on cartridge cases, most commonly when preparing new brass before first firing.
Do these mandrels include the die body?
No. This product includes the expanding mandrels only. The Expanding Mandrel Die body is sold separately.
Why use an expanding mandrel on new brass?
New brass is often damaged or inconsistent from bulk shipping. Running it over an expanding mandrel helps establish uniform neck tension before seating bullets.
Are these mandrels caliber specific?
Yes. Expanding mandrels are caliber specific and interchangeable when used with the Wilson Expanding Mandrel Die.
Will expanding mandrels size the case body?
No. Expanding mandrels only affect the case neck and do not size the body or shoulder of the case.
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