Redding Premium Neck Expander Die for Handgun Cartridges .40 S&W / 10mm Auto

The Redding Premium Neck Expander Die for .40 S&W and 10mm Auto handgun cartridges delivers precision brass preparation for reloaders who demand consistency and extended case life. Unlike full-length sizing dies that work the entire cartridge body, this neck expander die isolates sizing to the case mouth only—a critical distinction that preserves the structural integrity of your fired brass while improving seating consistency and accuracy.

This Redding reloading die gently bells the cartridge neck to accept the bullet, reducing run-out and promoting uniform powder column compression downrange. The selective neck-sizing approach means fired cases retain their original body and shoulder dimensions, which translates to tighter velocity spreads and more predictable point-of-impact shifts across multiple range sessions. Redding equipment is built to exacting tolerances from quality steel, and this die includes a protective plastic storage case for long-term tool preservation.

Reloaders preparing ammunition for .40 S&W and 10mm Auto pistols benefit from neck-only sizing when working with brass that has been fired from a single firearm. This approach is ideal for handgun shooters seeking to maximize the service life of quality brass while maintaining tight reloading tolerances. A critical operational note: do not interchange fired cases between different handguns of the same caliber when using a neck-sizing die, as each firearm produces slightly different case dimensions that must be respected to ensure safe, accurate ammunition assembly.

Redding's lifetime guarantee backs this reloading die, reflecting the brand's confidence in manufacturing quality and durability. For handloaders committed to consistent ammunition performance and brass economy, this neck expander die represents a proven tool for achieving professional-grade results at the bench.