RCBS Full Length Die Set .338 RPM - Model 28401

The RCBS Full Length Die Set for .338 RPM gives you the precision and reliability you need to build consistent, accurate ammunition. This two-die set—featuring a full-length sizer and seater die—handles the core operations: resizing fired cases to SAAMI minimum dimensions, decapping spent primers, and seating new bullets with integrated roll crimping. Whether you're handloading for a custom .338 RPM build or maintaining a working battery of precision rifle ammo, this set delivers the straightforward, no-frills performance RCBS has built its reputation on.

The full-length sizer die is engineered to bring your cases back to spec with precision. Built-in vents prevent the case damage that can result from trapped air or excessive lubricant during sizing, while headspace is held to minimum tolerances so the die doesn't inadvertently stretch or shorten your case body. The included seater die handles bullet seating and roll crimping in a single pass, saving you time and ensuring consistent neck tension across every round.

Both dies feature the standard 7/8"-14 thread found on most single-stage and progressive presses. They're machined from proprietary die steel for durability through thousands of reloading cycles. The set ships in RCBS's classic green die box, ready to organize in your reloading bench.

Key Features

• Full-length sizer die brings cases to SAAMI minimum dimensions and decaps in one stroke
• Integrated expander die neck opens to accept new bullets
• Seater die with built-in roll crimper secures bullets and tensions necks simultaneously
• Vented design prevents case damage from air and lubricant trapping
• Standard 7/8"-14 thread fits most single-stage and progressive presses
• Proprietary die steel for long service life

Specifications

Cartridge	.338 RPM
Die Count	2 (Full-Length Sizer and Seater)
Thread Size	7/8"-14
Sizer Type	Full-Length with Expander-Decapping Unit
Seater Features	Bullet Seater Plug with Roll Crimper
Packaging	Green Die Box

Frequently Asked Questions

What press will this die set work with?

The RCBS Full Length Die Set uses standard 7/8"-14 threads, which fit virtually all modern single-stage and progressive reloading presses that accept standard dies. Check your press manual to confirm compatibility if you're using older or specialized equipment.

Does this set include everything I need to reload .338 RPM?

This set includes the sizer and seater dies necessary for the core reloading operations. You'll still need to supply brass cases, primers, powder, and bullets separately, along with a scale, powder measure, and other standard reloading bench equipment.

What's included in the box?

The set includes a full-length sizer die with expander-decapping unit, a seater die with bullet seater plug and roll crimper, and a green RCBS die box for storage.

Can I use the roll crimper if I don't want to crimp?

The seater die includes a built-in roll crimper. Refer to RCBS documentation or your reloading manual for instructions on adjusting or bypassing the crimp function if your loads don't require it.