Rcbs Safari Full Length Die Set .450-400 Express 3"

The RCBS Safari Full Length Die Set for .450-400 Express 3" is purpose-built for reloaders who work with this specialized bottleneck cartridge. Whether you're handloading ammunition for a vintage safari rifle or other firearms chambered in this classic express round, this two-die set handles the critical steps of case preparation and bullet seating with the precision that RCBS has delivered for decades.

Full-length sizing is the foundation of safe, consistent reloads. The included Full-Length Sizer Die brings every case to SAAMI minimum dimensions, managing case body length and neck expansion in a single stroke. The die is vented to prevent case deformation from trapped air and excess lubricant—details that protect your brass and improve die longevity. Headspace is controlled to tight tolerances so the sizing process doesn't elongate your cases, keeping them in spec for reliable chambering and consistent pressure.

Once sized and prepared, bullets are seated and secured with the included Seater Die, which features a built-in roll crimper. This lets you seat and crimp in one operation, saving time and ensuring the bullet stays put under recoil. For handloaders working with smaller production runs of .450-400 Express ammunition, this two-die approach is all you need to produce safe, accurate loads.

Key Features

• Full-Length Sizer Die with Expander-Decapping Unit for complete case preparation
• Seater Die with integrated roll crimper for one-step bullet seating and crimping
• Vented sizer die design prevents trapped-air case damage
• Tight headspace control maintains case dimensions during sizing
• Purpose-designed for .450-400 Express 3" bottleneck cartridges

Specifications

Frequently Asked Questions

What does the Full-Length Sizer Die do?

The Full-Length Sizer Die resizes the outside of the case to SAAMI minimum cartridge dimensions, de-primes the old primer, and expands the neck to accept a new bullet. The vented design prevents case damage from trapped air and excess lubricant while maintaining tight headspace control.

Can I seat and crimp in separate steps, or does this die set require one-step crimping?

This set includes a Seater Die with an integrated roll crimper, which allows you to seat and crimp simultaneously in a single operation. This is the configuration supplied with this die set.

Is this die set suitable for my .450-400 Express 3" rifle?

Yes, this die set is specifically designed for the .450-400 Express 3" cartridge and its bottleneck case design. Confirm your rifle's chamber designation before ordering to ensure compatibility.

What comes in the box?

The set includes a Full-Length Sizer Die with Expander-Decapping Unit and a Seater Die with Bullet Seater Plug and integrated roll crimper—everything needed to resize, deprime, and seat ammunition for this cartridge.