Hornady 40 S&W, 10Mm Bullet Seating Die

The Hornady 40 S&W and 10mm bullet seating die is built for reloaders who demand consistency and reliability through thousands of rounds. Hornady's Custom Grade New Dimension dies are engineered from select steel with heat treatment that stands up to a lifetime of reloading—the company guarantees they won't wear out or break under normal use. Whether you're loading 40 S&W for duty carry, competition, or range work, or pushing 10mm for hunting and defense, this seating die ensures precise bullet seating every single time.

The seating die incorporates a sliding alignment sleeve that centers the bullet, case mouth, and seating stem before the round enters the die. This alignment geometry is the difference between mediocre groups and tight, consistent loads. You also get a built-in crimp ring—use it for a firm crimp on your rounds, or raise it out of the way if your load doesn't call for one. The choice is yours depending on your application and ammunition specs.

Setup is straightforward thanks to the included double-flat Hornady die lock rings, which grip firmly and won't shift once you've dialed in your seating depth. Everything ships in Hornady's custom plastic die box for safe storage and transport. This is the kind of die that becomes invisible in your reloading routine—it just works, shot after shot, year after year.

Key Features

• Precision bullet seating for both 40 S&W and 10mm ammunition
• Sliding alignment sleeve aligns bullet, case mouth, and seating stem for consistent results
• Integrated crimp ring—engage for a firm crimp or disengage for no-crimp loads
• Heat-treated steel construction designed for a lifetime of use
• Hornady double-flat die lock rings included
• Comes with protective plastic storage box
• Backed by Hornady's guarantee against wear and breakage under normal use

Specifications

Frequently Asked Questions

Can I use this die for both 40 S&W and 10mm in the same reloading session?

Yes. This die is designed to work with both 40 S&W and 10mm ammunition. You'll need to adjust your seating depth between calibers, but there's no need for separate dies.

Does this die include a crimp function?

Yes. The die has a built-in crimp ring that you can engage for a firm crimp or raise out of the way if your load specification calls for no crimp.

What comes in the box?

The seating die, double-flat Hornady die lock rings already installed, and a custom plastic storage box.

What's the alignment sleeve for?

The sliding alignment sleeve centers the bullet, case mouth, and seating stem before the round enters the die. This alignment geometry produces more consistent seating depth and bullet runout across your loads.