The Lee Precision 90839 Factory Crimp Die delivers consistent bullet seating and case mouth crimping for 7x57mm Mauser cartridges. This specialized reloading die eliminates bullet setback while ensuring uniform neck tension across every round.
What Makes This Different
Unlike standard crimp dies that only work the case mouth, the Factory Crimp Die applies controlled pressure to the entire cartridge neck area. The collet-style crimping mechanism creates uniform bullet grip without distorting the case mouth. This design maintains consistent overall cartridge length while preventing bullet migration during handling and feeding.Key Features
- Collet-style crimping system for uniform neck tension
- 7/8-14 standard thread fits most single-stage and turret presses
- Hardened steel construction with precision-machined surfaces
- Post-sizing feature corrects minor case dimension variations
- Works with both jacketed and cast bullets
- Includes detailed instructions and load data references
- Compatible with 7x57mm Mauser cases from all manufacturers
Technical Specs
- Caliber: 7x57mm Mauser (.275 Rigby)
- Thread: 7/8-14 TPI standard
- Material: Heat-treated alloy steel
- Finish: Black oxide coating
- Die height: Approximately 3.5 inches
- Weight: 8 ounces
- Country of origin: United States
- Manufacturer warranty: Limited lifetime
