The Hornady #15 Precision Machined Shellholder is a dedicated metallic cartridge reloading tool engineered specifically to hold and align .376 Steyr cartridge cases. CNC-machined from solid, heat-treated steel, this universal shellholder withstands the extreme pressures of full-length case resizing, decapping, expanding, priming, and bullet seating. Built with a radiused mouth profile, it ensures smooth case insertion and secure rim engagement across single-stage and turret reloading presses.

Key Features

• Calibre-Specific Machining: Precision-cut to fit the exact rim dimensions of the .376 Steyr cartridge, preventing case slippage and stuck cases under heavy press leverage.
• Heat-Treated Steel Construction: Machined from solid steel and heat-treated to resist premature wear, surface deformation, and warping during high-pressure resizing operations.
• Radiused Entry Mouth: Features a wide, rounded mouth opening that guides cartridge rims smoothly into the retention slot for efficient case handling.
• Universal Press Compatibility: Standard universal t-slot base fits Hornady single-stage presses, turret presses, the Hornady Cam-Lock Case Trimmer, and Hornady Hand-Held Priming Tools, as well as standard universal press rams from other major reloading tool manufacturers.

Specifications

• Brand: Hornady
• Model / MPN: 390555
• Shellholder Number: #15
• Material: Heat-treated, precision-machined solid steel
• Calibre Compatibility: .376 Steyr
• Tooling Compatibility: Standard universal t-slot press rams, single-stage presses, turret presses, and compatible hand-priming/trimming tools
• Power Requirements: None (manual mechanical component)

Who is the Hornady #15 Precision Machined Shellholder For 376 Steyr Caliber for?

• Large game hunters in Australia — requires a dedicated .376 Steyr reloading shellholder to handload custom heavy-hitting ammunition for hunting large sambar deer, scrub bulls, and water buffalo where commercial factory loads are difficult to source.
• Medium-bore rifle handloaders — requires exact rim alignment for the .376 Steyr cartridge during single-stage case resizing, expanding, and bullet seating operations to maintain precise benchtop tolerances.

Less suitable for: Progressive reloading setups. This single-stage shellholder cannot be mounted to progressive presses; operators using progressive presses such as the Hornady Lock-N-Load AP require a dedicated rotary progressive shell plate instead.