The Redding .260 Remington Ackley Improved 40° Deluxe 3-Die Set (MPN: 84623) is a precision handloading toolset designed for resizing, decapping, expanding, and seating .260 Rem AI cartridges. Machined from heat-treated alloy steel in atmospheric furnaces and finished with hand-polished surfaces, this Series D set provides dual sizing options to balance brass longevity with chambering reliability. The dies utilise industry-standard 7/8"-14 threads, making them compatible with standard Australian single-stage, turret, and progressive reloading presses.

• Three-Die Versatility: Contains a Full-Length (FL) sizing die, a Neck (NK) sizing die, and a standard Bullet Seating (ST) die with a built-in crimp ring.
• Full-Length Sizer: Restores fired brass to factory dimensions, resets the 40° shoulder angle to maintain headspace, and decaps spent primers via an integrated decapping rod and standard expander ball.
• Neck Sizing Function: Resizes only the case neck to minimise brass work-hardening and preserve the fire-formed fit of the case to a specific rifle chamber.
• Precision Seating Die: Features an internal bullet alignment guide for concentric seating, complete with an adjustable seating plug and roll/taper crimp capability.
• Mounting Compatibility: Standard 7/8"-14 thread interface fits presses such as the Redding Big Boss, RCBS Rock Chucker, Lyman, and Hornady (requires a standard #1 shellholder, sold separately).

Specifications

• Manufacturer Part Number (MPN): 84623 (Series D)
• Calibre: .260 Remington Ackley Improved (40° shoulder)
• Thread Pitch: 7/8"-14 standard thread
• Die Set Configuration: 3-Die Set (Full-Length Sizer, Neck Sizer, Bullet Seater)
• Material: Heat-treated, hand-polished alloy steel
• Packaged Weight: Approximately 0.65 kg to 0.75 kg
• Included Accessories: Storage box and spare decapping pin

Who is the Redding 260 Rem Ackley Improved 40° Deluxe Die Set for?

• Long-range target shooters — provides a dedicated 3-die set engineered specifically to bump and maintain the 40° shoulder angle required for consistent headspace and chambering in bolt-action rifles chambered for .260 Rem AI.
• Handloaders seeking extended brass life — includes both neck-sizing and full-length sizing dies with standard 7/8"-14 threads, allowing reloaders to work only the neck on fire-formed cases to extend brass service life across repeated firings.

Less suitable for: Standard, non-improved .260 Remington factory cases without prior fire-forming, or shooters loading brass for multiple distinct rifle chambers using only the neck sizer; handloaders requiring micrometer-adjustable neck tension in .001" increments or sub-.001" concentricity should choose a dedicated bushing-style sizing die or micrometer competition seating die set.