L.E. Wilson 33 Caliber (.337) Expanding Mandrel Die EXP-33MD

Description

The L.E. Wilson 33 Caliber Expanding Mandrel Die is built for precision reloaders who want to take the guesswork out of neck tension. Instead of working the outside of the neck like a bushing, this die uses a .337 mandrel to size the neck from the inside, pushing thickness variation to the outside of the case where it does not affect bullet grip. The result is more uniform neck tension round to round, which shows up as lower standard deviation and tighter groups at the target.

Why the EXP-33MD Mandrel Die Earns a Spot on Your Bench

This is a go-to tool for prepping new brass. Factory cases, even the high-end stuff, often show up with dinged or out-of-round necks from bulk shipping and handling. Running them over the mandrel irons out the necks and sets a consistent inside diameter before that first firing. A lot of handloaders also lean on it to clean up necks after bushing sizing, or when forming cases from one caliber up to the next. The mandrel is tapered to ease into the neck and expand it to slightly under bullet diameter so you are not overworking the brass.

Getting the Most Out of the L.E. Wilson 33 Caliber Expanding Mandrel Die

The die body features a cut-out window so you can watch the case align and dial in your depth without ruining that first piece of brass. It threads into any standard 7/8-14 reloading press and includes an L.E. Wilson lock nut so your setting stays put once you have it dialed. One tip worth repeating: lightly coat the inside of each neck with a graphite or dry neck lube before sizing. That cuts friction, gives you a more consistent size, and extends the life of the mandrel.

Built in the USA from stainless steel, the EXP-33MD is made to hold up over years of use on the bench. It ships with the .337 mandrel installed, and additional mandrels in other calibers are available separately if you want to run one die body across multiple cartridges.