Lee Precision 90703 Collet 2-Die Set .257 Roberts Reloading Dies

The Lee Precision 90703 Collet 2-Die Set delivers precision neck sizing and bullet seating for .257 Roberts cartridges. This collet die system maintains case concentricity while extending brass life through minimal case working.

What Makes This Different

Lee's collet die technology sizes only the case neck, leaving the body untouched to preserve perfect chamber fit. Unlike conventional full-length sizing dies that work the entire case, this system reduces brass stress and maintains optimal headspace. The mandrel-based design ensures consistent neck tension across all cases, producing more uniform bullet release and improved accuracy potential.

Key Features

• Collet die sizes neck only, preserving case body dimensions
• Dead length bullet seating die with built-in crimp adjustment
• Hardened steel construction with precision-machined threads
• Universal shell holder included (R2 size for .257 Roberts)
• Powder through expanding die capability
• Compatible with all standard 7/8-14 TPI reloading presses
• Instructions and load data included with die set

The collet system produces ammunition that chambers effortlessly in the rifle it was fired from while maintaining neck tension specifications. Benchrest shooters and precision rifle competitors rely on this minimal case working approach to achieve consistent velocities and extend brass life beyond 20 reloadings. The bullet seating die features micrometer-adjustable seating depth and optional roll crimp for hunting applications.

Technical Specs

• Caliber: .257 Roberts (.257 Rob)
• Thread specification: 7/8-14 TPI standard
• Die body material: Heat-treated alloy steel
• Includes: Collet neck sizing die, bullet seating die, shell holder
• Compatible presses: All standard single-stage and turret presses
• Mandrel size: .257 inch diameter
• Country of origin: United States
• Manufacturer part number: 90703

This die set represents the most efficient approach to .257 Roberts case preparation for shooters who fire cases in the same rifle repeatedly. The extended brass life and improved accuracy potential justify the investment for serious handloaders.