This RCBS two-die set is designed for reloading bottleneck cases for the 7×57 Mauser cartridge. The set includes a full-length sizer die with an expander-decapping unit and a seater die with a bullet seater plug. The full-length sizer brings cases to SAAMI minimum cartridge dimensions while the seater die features a built-in roll crimper. The dies use standard reloading threads for compatibility with common presses.
Key Specifications
- 7X57 Mauser caliber for reloaders working with this cartridge.
- Full-Length die set intended for full-length sizing of bottleneck cases.
- 2 dies included: a sizer and a seater.
- Full-Length Sizer with Expander-Decapping included to size outside of the case, de-prime, and expand the neck.
- The set uses a 7/8″-14 standard thread for mounting to presses.
- Sizes to SAAMI minimum cartridge dimensions to control headspace during full-length sizing.
- Vented die design to reduce the risk of case damage from trapped air or excess lubricant.
- Headspace held to minimum tolerances to help avoid changing case body length during sizing.
- Built-in roll crimper in the seater die secures the bullet while seating.
- 1.85 x 4.50 x 6.00 inches listed package dimensions.
Engineered for reloaders who value reliable, repeatable case preparation, this RCBS full-length die set provides the features needed for consistent sizing and secure bullet seating. Its vented sizer, controlled headspace, and integrated crimping function make it a practical addition to a reloading bench for those working with 7×57 Mauser cases.
