Lee Undersize Mandrel .262 For 6.5X55 .260 Remington & 6.5 Creedmoor

The Lee Undersize Mandrel .262 for 6.5x55, .260 Remington, and 6.5 Creedmoor is a precision reloading accessory engineered to increase bullet grip tension in Lee collet dies. Reloaders who require a tighter fit than the factory-standard light press fit will find this undersize mandrel essential for achieving consistent neck tension across cartridges with harder brass or variable hardness characteristics.

This .002-inch undersize mandrel directly addresses the tension control problem in collet die setup. When working with 6.5x55 Swedish, .260 Remington, and 6.5 Creedmoor cartridges, the standard mandrel may not grip bullets firmly enough if case neck hardness exceeds average specifications. By stepping down to the .262 undersize diameter, reloaders can achieve a measurable increase in grip pressure without forcing the collet beyond safe operating limits. The result is improved concentricity, reduced runout, and more uniform seating depth—all critical variables in precision rifle ammunition.

This mandrel is purpose-built for serious handloaders developing match-grade ammunition for competition shooting, long-range hunting, or precision rifle platforms. It's particularly valuable for those processing large volumes of brass with inconsistent neck characteristics or working in high-round-count shooting environments where neck brass work-hardens over multiple reloading cycles.

Lee Precision manufactures collet dies as modular systems, allowing shooters to customize fit and tension through mandrel selection rather than replacing entire dies. This approach is cost-effective and precise. The .262 undersize mandrel integrates seamlessly with existing Lee collet die hardware (SKU LEE90069, MPN 90069) and requires no modifications to your reloading setup.