Hornady Shell Holder #10 - .357 Sig/.40 S&W/10mm Auto

The Hornady Shell Holder #10 is a precision-engineered reloading component designed for .357 Sig, .40 S&W, and 10mm Auto ammunition. This shell holder serves as the critical interface between your press and cartridge case during the reloading cycle, ensuring consistent, accurate positioning across every round processed. Machined from solid steel and heat-treated for durability, the #10 holder delivers the dimensional precision required for reliable high-volume reloading operations.

Shell holders are caliber-specific because case head diameters vary across cartridge families. The #10 configuration is engineered specifically to cradle the .357 Sig, .40 S&W, and 10mm Auto case heads—all intermediate-sized pistol cartridges with similar dimensional requirements. This precision fit eliminates the case movement and alignment errors that lead to primer seating inconsistencies, case bulging, or damage during processing. Heat treatment hardens the steel against the repeated impact of the press cam, extending service life through thousands of reload cycles. The holder integrates seamlessly with Hornady's full accessory ecosystem, including their Handheld Priming Tool, single-stage presses, and progressive reloading systems.

Handloaders working with .40 S&W for duty or competition shooting, .357 Sig for carry applications, and 10mm Auto for hunting or defensive use rely on shell holders to maintain the tight tolerances necessary for safe, consistent ammunition. Whether you're processing brass for a 100-round range session or maintaining a 5,000-round reloading cycle, the proper shell holder prevents costly mistakes and ensures every primer seats uniformly, every powder charge meters correctly, and every bullet is seated to specification. Reloaders who prioritize accuracy and consistency choose holders matched precisely to their cartridge dimensions rather than attempting to force-fit oversized or undersized alternatives.