Lee Undersize Mandrel .241" - For Collet Sizing Dies

The Lee Undersize Mandrel .241" for Collet Sizing Dies is a precision reloading component designed for handloaders who demand exacting ammunition specifications. This mandrel is purpose-built to work with Lee's collet sizing die system, allowing shooters and reloaders to achieve consistent bullet seating and case mouth sizing. Whether you're preparing match-grade rifle ammunition or precision handloads for law enforcement training, this tool eliminates runout and ensures repeatable results across large production volumes.

The .241" undersize mandrel is engineered to compress case necks uniformly, reducing bullet runout to near-zero tolerances—critical for accuracy at distance. Its compact design (2.05 x 0.6 x 3.8 inches) fits seamlessly into the collet sizing die assembly without requiring separate adjustment tools or complex setup procedures. The mandrel's hardened steel construction withstands thousands of cycles without wear, maintaining dimensional integrity across extended reloading sessions. This precision-ground component is part of Lee's modular system, meaning it integrates directly with compatible collet dies for efficient production without the need for additional equipment.

Reloaders working with match ammunition, competitive shooters, and law enforcement armorers benefit most from this mandrel's accuracy and reliability. The .241" size accommodates standard centerfire rifle cartridge neck diameters after initial full-length sizing, making it suitable for high-volume production in training environments or precision rifle programs. Installation is straightforward—simply insert the mandrel into your Lee collet sizing die, and it's ready for use. Compatibility with the full Lee collet die range ensures this mandrel becomes an essential component in any serious reloader's toolkit.