Lee Precision .260 Undersize Mandrel for Collet Sizing Dies

The Lee Precision .260 Undersize Mandrel is a precision-ground replacement component designed for Lee Collet Neck Sizing Dies used with .264 caliber rifle bullets. This mandrel supports precision handloading applications by sizing the inside of the case neck slightly smaller than standard, increasing bullet grip during ammunition assembly.

By reducing the internal neck diameter, the undersize mandrel increases neck tension and promotes more consistent bullet retention during the reloading workflow. This adjustment can help maintain uniform cartridge construction and stable bullet positioning prior to firing, which is valuable for reloaders focused on repeatable performance and consistent ammunition assembly. Manufactured from precision-ground steel, the mandrel is built to maintain consistent dimensions and reliable operation across extended bench use.

Quick Highlights:
• Product Type: Undersize Mandrel
• Caliber Compatibility: .264 Caliber Rifle Cartridges
• Bullet Weight: Not Applicable
• Material: Precision-Ground Steel
• Tip Type / Design: Undersize Neck Sizing Mandrel
• Included Components: .260 Undersize Mandrel
• Ideal For: Precision Reloading / Neck Tension Adjustment

Use Cases & Applications:
• Precision handloading
• Bench-mounted reloading setups
• Neck tension adjustment in rifle ammunition assembly
• Accuracy-focused load development workflows
• Bolt-action rifle cartridge reloading

Technical Details:
Manufacturer: Lee Precision
Model: Undersize Mandrel .260
Product Type: Mandrel for Collet Sizing Dies
Caliber Compatibility: .264 Caliber Rifle Cartridges
Bullet Weight: Not Applicable
Material: Steel
Finish: Not Specified
Included Components: .260 Undersize Mandrel

Trusted by reloaders who prioritize stable flight characteristics, consistent results, and refined bench setup execution.