Hornady 38 Special, 357 Magnum Expander Die

If you reload .38 Special or .357 Magnum, a dedicated expander die is one of those tools that transforms your bench routine from tedious to efficient. The Hornady 38 Special, 357 Magnum Expander Die handles the critical middle step: opening the case mouth just enough to accept powder and bullets cleanly, without deforming the case or creating feeding problems down the line. It's the kind of single-purpose tool that seems simple until you've worked without one and realize how much smoother your process becomes.

This is a straight-walled case specialist. Once your brass is resized and primed, the expander die widens the case mouth to the precise diameter needed for your bullets and powder charge. That controlled opening—neither too tight nor too loose—eliminates the friction that slows you down and the case damage that weakens brass over multiple loadings. Hornady built this die to their usual standards: precision machined surfaces for smooth, consistent operation and straightforward adjustment so you dial it in once and trust it to perform the same way for the next hundred rounds.

Reloaders who shoot .38 Special for cowboy action, bullseye competition, or general practice, and those who load .357 Magnum for hunting or personal defense, both benefit from having the right tool for each step. This die earns its place on any serious handloader's turret or progressive press.

Key Features

• Sized specifically for .38 Special and .357 Magnum straight-walled cases
• Precision-machined for smooth, consistent case mouth expansion
• Straightforward adjustment for repeatable performance
• Built to exacting Hornady standards for durability and reliability

Specifications

Frequently Asked Questions

Will this expander die work with my press?

Hornady reloading dies use standard 7/8-14 TPI threads and fit any single-stage, turret, or progressive press designed for standard die dimensions. Confirm your press accepts standard dies before ordering.

Can I use this expander die for both .38 Special and .357 Magnum?

Yes. Because both calibers use the same case diameter, this single die handles both .38 Special and .357 Magnum reloads.

What does an expander die actually do?

The expander die opens the mouth of a resized, primed case to the correct diameter for bullet and powder insertion. This controlled widening prevents case damage, ensures smooth bullet seating, and improves consistency from round to round.

Is this die suitable for progressive press reloading?

Yes. The Hornady expander die is compatible with progressive presses, making it useful for high-volume reloaders who want to streamline their workflow across multiple stations.