What die sets are compatible with the Redding 39242 .243 Cal Size Button?

The Redding 39242 size button is designed to fit standard Redding Full-Length Sizing Dies, Neck Sizing Dies, and Type S Bushing Sizing Dies chambered for 6mm and .243 calibre bottleneck cartridges. Please note that it is not compatible with Redding Competition Bushing Neck Sizing dies.

Do I need to use case neck lubrication with this standard steel size button?

Yes, standard carbon steel expander buttons like the Redding 39242 require internal case neck lubrication, such as dry neck lube or sizing wax, prior to sizing. This prevents excessive friction, brass stretching, and unwanted neck runout during the reloading stroke.

When should I choose the standard steel size button over a carbide or tapered alternative?

The Redding 39242 standard factory replacement is ideal for routine maintenance of standard Redding 6mm die sets when processing fired brass with normal dimensions. However, if you are necking up donor brass from .22 calibre or require non-lubricated free-floating action, you would be better suited looking at Redding's Tapered or Carbide size button kits.

243 Size Button - Redding 39242

The Redding 243 Cal Size Button (MPN: 39242) is a standard factory replacement expander button designed for Redding bottleneck sizing dies. Manufactured from machined carbon steel, this component threads directly onto the decapping rod within the die body. As a decapped case is extracted from the sizing die, the button expands the case neck from the inside to establish the correct internal neck diameter and consistent bullet tension for .243 calibre and 6mm rifle cartridges.

Key Features

Direct OEM Replacement: Serves as a standard factory replacement for lost, worn, or scratched expander buttons in Redding die sets.
Internal Neck Expansion: Sets the final inside case neck diameter to approximately 0.243 inches (6mm) during the downward stroke of the reloading press.
Machined Steel Construction: Built from durable carbon steel, weighing under 25 grams.
Die Compatibility: Fits standard Redding Full-Length Sizing Dies, Neck Sizing Dies, and Type S Bushing Sizing Dies (not compatible with Redding Competition Bushing Neck Sizing dies).

Product Specifications

Manufacturer: Redding Reloading Equipment
Part Number (MPN): 39242
Calibre: .243 Calibre / 6mm
Cartridge Compatibility: .243 Winchester, 6mm Creedmoor, 6mm BR, .243 Win Improved, and related 6mm bottleneck cases
Material: Machined carbon steel
Weight: Under 25 g
Expander Diameter: ~0.243 in (~6.17 mm)

Who is the Redding 243 Cal Size Button for?

Precision rifle competitors reloading .243 Win or 6mm Creedmoor brass — requires an OEM sizing die expander button machined to an expander diameter of ~0.243 inches (6mm) to set uniform internal neck tension across high-volume match cases.
Handloaders maintaining Redding standard sizing dies for 6mm bottleneck cartridges — needs a direct-fit steel replacement expander weighing under 25 grams to restore factory specifications on Redding Full-Length, Neck, or Type S sizing dies without modifying the decapping rod assembly.

Less suitable for: Handloaders seeking non-lubricated neck expanding or free-floating self-centering action to minimise neck friction and runout, where a free-floating carbide size button kit suits better; or handloaders expanding undersized brass and necking up donor brass from smaller calibres, where an expander button with an extended tapered profile suits better.

SKU	RD41639LP
Model #	39242
Brand	Redding
Shipping Weight	1.0000kg

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Redding 39242 Size Button 243 Calibre 6mm Reloading Spare

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