RCBS 3 Die Roll Crimp Set - Group E - Straight Walled Cartridges .38-40 Win

The RCBS 3 Die Roll Crimp Set for Group E straight-walled cartridges in .38-40 Winchester provides a complete reloading solution for shooters working with classic rifle ammunition. This three-die set delivers the precision and reliability needed to produce consistently safe and accurate rounds for lever-action rifles and other firearms chambered in this historic cartridge. The system is purpose-built for handloaders who demand exacting control over every stage of the reload process.

The set includes a steel Sizer Die that resizes fired cases to original specifications while removing spent primers—cases require lubrication during this operation to prevent damage and ensure smooth sizing. The Expander Die then opens the case mouth to the proper diameter for bullet seating while imparting the necessary flare or bell to the case mouth, which promotes reliable bullet feeding and prevents bullet slippage during handling. The Seater Die completes the process by seating the bullet to precise depth and applying a roll crimp that securely locks the bullet in place without deforming the cartridge or compromising structural integrity. Roll crimping is particularly important for lever-action and semi-automatic firearms where cartridges are fed from tubular or box magazines under spring pressure.

This die set is engineered for handloaders working with .38-40 Winchester ammunition—a straight-walled cartridge commonly used in classic rifles and cowboy action shooting applications. The RCBS brand is recognized throughout the reloading community for manufacturing precision tooling that maintains tight tolerances across hundreds of reload cycles. Whether you're developing loads for hunting, sport shooting, or historical rifle recreation, this three-die set provides the mechanical foundation for producing reliable, properly crimped ammunition that cycles smoothly through magazine-fed actions.