The Mighty Armory GOLD MATCH .223 rem / 5.56 NATO sizing die will size and decap .223 Remington and 5.56 NATO cases.
The Gold Match .223 / 5.56 full length sizing die restores brass to true SAAMI specification from the case head to the neck with a simple turn of the die, ensuring:
- Reliable feeding in AR-15 rifles
- Controlled headspace
- Proper shoulder bump
- Uniform neck tension
- Consistent chamber fit
Reloading .223 Remington and 5.56 NATO brass requires precise control of headspace, base diameter, and neck geometry to ensure safe pressures and reliable feeding across a wide range of chambers. Inconsistent sizing can lead to hard chambering, erratic pressures, short brass life, and inconsistent velocity spreads.
The Gold Match .223 / 5.56 sizing die is engineered to size fired brass back to true SAAMI spec geometry from the case head through the shoulder and neck.
Full Length Sizing to SAAMI Spec
The .223 rem sizing die has an extended, full length sizing area that will bring your case measurements back to SAAMI Spec to prevent under-sizing or over-sizing at the neck, shoulder and base of the case. SAAMI Spec resizing results in proper case pressure, cleaner burning powder, reliable chambering and your brass will last longer for more reloads.
Full length sizing is recommended for all rifle cases. Neck sizing can lead to overexpanded cases and reduce reloading times as it weakens the brass. A hard, smooth sizing surface that is consistent in sizing, especially head-spacing is of the utmost importance.
Full length sizing removes case growth and chamber-specific deformation that neck sizing alone cannot correct, making it the preferred method for reloaders seeking reliability and consistency of their rounds.
Precision Machined to Tight Tolerances
Mighty Armory reloading dies are precision machined to tight tolerances ensuring consistent and uniform sizing and concentricity. The Mighty Armory Gold Match Rifle Sizing Dies are precision machined from high grade tool steel:
- perfect vertical alignment
- single point cut finish
- extremely smooth bore (5 bore finish) at 60 Rockwell hardness
Drop-In Mandrel Shaft
The .223 sizing die includes a drop-in .223 rem mandrel shaft - Swiss-machined, heat treated to 50 Rockwell, and extremely strong. The mandrel expander shaft ensures uniform and consistent case mouth expansion for proper bullet seating.
The threads inside the shaft will accept either a Mighty Armory decapping pin or a pointer. The pointer is used in place of the decapping pin. It protects the shaft threads and acts as a guide when sizing the case.
The mandrel shaft sits concentrically inside the die bore with three points of contact: The free bore, the angle and the flat of the top. The first modular die in the reloading industry that ensures lockup with the cap.
Decap and Size in One Pass
The one-and-done sizing and decapping of your .223 Rem / 5.56 NATO brass will be effortless. The .223 sizing die includes a primer flicker cap and two .078" diameter decappings pins. The die will easily decap and resize over a million cycles. Turn the reloading die into your press, turn the die down or up and easily set shoulder bump from zero to -.005. All Mighty Armory rifle sizing decapping dies now include the primer flicker cap and spring. The spring decapping action prevents primer pullback and press chute jams.
Key Benefits
- Mighty Armory .223 Rem Gold Match Die sizes for Full Length / Shoulder Bump up to -.005 bump. (The Mighty Armory FLHS die head space bump is now standard on our FL die).
- 100% CNC machined, Made in the USA.
- High grade tool steel and heat treated.
- Smooth 5 Bore Finish.
- Concentricity -.0005 at the case mouth and shoulder radius.
- Modular design, no tools needed.
Performance Results
Proper sizing geometry directly affects:
- Case pressure consistency
- Cleaner powder burn
- Reliable chambering and extraction
- Lower velocity variation
- Increased brass longevity
Sizing with the .223 Rem Gold Match precision die produces consistent reloads built on uniform brass geometry, the foundation of precision ammunition. Sizing with Mighty Armory reloading dies will result in precision reloads that perform significantly better than factory.
Lubrication Recommendations
For Single Stage or Turret Presses: Use Imperial Sizing Wax.
For Progressive Presses: Use PEG75 lanolin spray for smooth, high-volume operation.
See, Feel and Shoot the Difference with Mighty Armory Precision Reloading Dies.
- "World's Toughest" Reloading Dies
- Precision Reloading Tools
- Made in the USA
