Product Overview

Take control of your neck tension the right way with the Redding Expanding Mandrel Precision Expanding Die. Machined on CNC lathes, heat-treated and built around a smart angled alignment system, this die body keeps the mandrel perfectly centred so your case necks come out straight, consistent and ready to shoot tight groups. It’s the kind of bit of kit you bolt into the press once and then wonder how you ever loaded without it.

Designed for serious handloaders chasing repeatable performance, the Redding Expanding Mandrel system lets you fine‑tune neck tension in tiny 0.0005" steps using separate precision mandrels. The result is smoother bullet seating, less runout and more predictable velocities – exactly what you want whether you’re stretching things out on steel or lining up a careful shot on game. Tough steel construction, 7/8"‑14 threads and a plug and lock ring setup mean it drops straight into your standard press and is built to cop years of use on the bench.

Key Features

• Precision Expanding Die body is engineered to give handloaders precise control over case neck I.D., helping you fine-tune neck tension for more consistent bullet release and improved accuracy.
• CNC-machined and heat-treated construction maintains dimensional integrity over a lifetime of use, ensuring repeatable performance across thousands of reloads.
• Angled alignment surfaces between the die body and mandrel promote perfect concentric alignment when assembled, reducing runout and enhancing overall cartridge uniformity.
• Threaded retention plug and lock ring securely hold the mandrel assembly in place, so settings stay locked in during extended reloading sessions.
• Compatible with Redding Precision Expander Mandrels available in .0005" diameter increments below bullet size, allowing you to tailor neck tension to specific rifles, loads, and accuracy goals.
• Designed to work with high-quality, hardened tool-steel mandrels that are precision-ground to final diameter, supporting smooth, uniform expansion of case necks.
• Standard die body format integrates easily into common reloading setups, making it simple to add precision neck expansion to your existing workflow.
• Purpose-built for rifle ammunition reloading, giving serious shooters and precision handloaders a dedicated tool for optimising neck tension.