The RCBS Roll Crimp Seating Die, .38 Special/.357 Magnum (brand part no. 18342) is a single-station seating die for handloaders building .38 Special and .357 Magnum revolver ammunition on a single-stage or turret press. It combines bullet seating with a built-in roll crimp in one pass, rolling the case mouth into the bullet’s crimp groove to keep the bullet from shifting under recoil. RCBS machines the die from hardened steel to hold seating depth and crimp pressure consistently through high production runs. It is a straightforward addition to a revolver handloader’s bench who wants a firm, repeatable crimp without running a separate crimping die.

Key Specifications

• Built-in roll crimp rolls the case mouth into the bullet’s crimp groove during seating, eliminating a separate crimping station.
• Chambered for .38 Special/.357 Magnum sized to this revolver cartridge family for correct seating depth and crimp diameter.
• Hardened steel construction holds tight tolerances through repeated seating cycles.
• Standard 7/8-14 die thread fits any single-stage, turret, or progressive press using the industry-standard thread.

Frequently Asked Questions

Does this die replace a separate crimp die? Yes, the roll crimp is built into the seating stem, so this single die seats and crimps the case mouth in one step.

Can I use this die for both .38 Special and .357 Magnum? Yes, the die is machined to handle both cartridges since .357 Magnum brass shares the same case head and bullet diameter as .38 Special.

Buy the RCBS Roll Crimp Seating Die, .38 Special/.357 Magnum

Order the RCBS Roll Crimp Seating Die, .38 Special/.357 Magnum from RCBS for a secure, repeatable crimp on your revolver loads. Pick it up from our Lubbock, Texas gun shop and add it to your reloading bench. Browse our reloading dies lineup for more.