The Redding 223 Rem Trim Die (MPN: 83111) is a precision reloading tool engineered for manual file-trimming of .223 Remington and 5.56x45mm NATO cartridge cases. Unlike standard trim dies that size brass down to full-length sizing die dimensions, this die is cut to standard chamber dimensions. This design allows handloaders to trim extended case mouths flush with a hand file without overworking the brass or altering fire-formed shoulder dimensions. Built from heat-treated, case-hardened alloy steel, the top surface resists marring from standard metal files, and the unit mounts into standard single-stage and turret reloading presses via an industry-standard 7/8"-14 TPI thread interface.

Key Features

• Chamber-Dimension Profiling: Holds .223 Remington brass to standard chamber dimensions rather than full-length sizing dimensions, preserving case geometry while trimming.
• Hardened Top Surface: Constructed from case-hardened alloy steel to withstand repeated contact with manual hand files during trimming operations.
• Standard Thread Mounting: Features an industry-standard 7/8"-14 TPI thread to fit standard reloading press receivers.
• Case Forming Functionality: Functions as an intermediate forming and cut-off die when converting .223 Remington parent brass into wildcats or shortened calibres like .300 Blackout or .221 Remington Fireball.
• Press-Mounted Mechanical Operation: Operates entirely by manual hand power on the press ram with no electrical power requirements.

Specifications

• Cartridge Compatibility: .223 Remington / 5.56x45mm NATO
• Thread Interface: 7/8"-14 TPI
• Compatible Shellholder: Redding Shellholder #10 (Part #11010)
• Material: Heat-treated, case-hardened alloy steel
• Manufacturer Part Number: 83111

Who is the Redding 223 Rem Trim Die for?

• Handloaders processing low-to-medium batch volumes — requires manual file-trimming of .223 Remington cases to exact chamber dimensions via standard 7/8"-14 TPI press threading without performing unnecessary full-length resizing.
• Custom case-forming reloaders — provides an intermediate shortening and forming step to establish rough case lengths when converting parent .223 Remington brass into shortened wildcat calibres on a standard 7/8"-14 TPI reloading press.

Less suitable for: High-volume production trimming exceeding hundreds or thousands of rounds per hour, where motorized lathe trimmers or powered trim systems are better suited.