The Redding #10 Competition Shellholder Set provides handloaders with precise control over cartridge headspace and shoulder setback without altering the position of the full-length sizing die. Built from heat-treated machined steel with a black oxide finish, this 5-piece set features five distinct shellholders with increased deck heights above the standard 0.125-inch (3.175 mm) specification. By maintaining a hard cam-over or solid die-to-shellholder contact on a standard single-stage or turret press, reloaders can quickly change case shoulder clearance by simply swapping the shellholder.

Key Features

• Headspace and Shoulder Control: Enables step-by-step case sizing adjustments without threading or recalibrating sizing dies.
• Five Deck-Height Steps: Includes increments of +.002″, +.004″, +.006″, +.008″, and +.010″ over the standard 0.125″ deck height.
• Clear Markings: Each shellholder is stamped with its specific offset measurement for straightforward identification.
• Universal Press Interface: Uses a standard snap-in base compatible with universal single-stage and turret reloading presses.
• Protective Storage: Supplied in a dedicated polymer storage box for organisation on the reloading bench.

Specifications

• Manufacturer Part Number (MPN): 11610
• Set Quantity: 5 shellholders
• Deck Height Increments: +0.002″ (0.051 mm), +0.004″ (0.102 mm), +0.006″ (0.152 mm), +0.008″ (0.203 mm), +0.010″ (0.254 mm) over standard 0.125″ (3.175 mm)
• Cartridge Compatibility: .223 Remington, 5.56×45mm NATO, .300 AAC Blackout, .204 Ruger, .17 Remington, and related cases with a 0.378″ rim diameter
• Material / Finish: Machined steel with black oxide finish
• Total Boxed Weight: Approximately 180–230 g

Who is the Redding #10 Competition Shellholder Set - 223 for?

• Precision rifle competitors loading .223 Remington family cartridges — provides exact shoulder bump regulation in +.002″ steps up to +.010″ above the nominal 0.125″ deck height, allowing competitors to match custom-chambered bolt-action rifles to exact headspace tolerances using this shellholder set.
• Handloaders seeking custom shoulder clearance to extend brass life — allows exact control over case sizing dimensions down to +0.002″ (0.051 mm) increments to avoid over-working case brass during full-length resizing operations.

Less suitable for: Cartridge cases with base diameters outside the 0.378-inch rim specification, which require a different calibre-specific shellholder set number, or high-volume progressive presses that require dedicated multi-station shellplates rather than snap-in single shellholders.