What specific calibers and cartridges is the Redding 40276 size button compatible with?

The Redding 40276 size button is designed specifically for .270 caliber and 6.8mm bottleneck rifle cartridges. It works seamlessly with popular rounds such as the .270 Winchester, .270 WSM, and 6.8 Western using Redding sizing dies.

Will this Redding size button fit into my RCBS or Hornady reloading dies?

No, this component is engineered exclusively to fit standard Redding threaded decapping rods. It is not compatible with sizing dies from other manufacturers due to differences in thread pitches and rod dimensions.

Do I need to use any special lubrication when operating the Redding 40276 size button?

Yes, because this is a precision-machined steel expander button, inside-neck lubrication such as dry lube, mica, or resizing wax is required. Proper lubrication prevents brass chatter, heavy drag, and unintended case-neck elongation during the press upstroke.

Are there any electrical or regulatory requirements needed to use this reloading accessory in Australia?

No electrical certifications or power sources are required because the Redding 40276 is a purely mechanical reloading tool. It is fully legal to purchase, own, and use as an unrestricted metallic reloading component across Australia.

What is the exact nominal diameter of the Redding 40276 expander button?

The Redding 40276 features a nominal diameter of .276 inches. This precise dimension is optimized to stretch and uniform the inside case neck to achieve correct, consistent neck tension for standard .277 inch bullet diameters.

What should I do if I want to upgrade from this standard steel size button to reduce case-mouth friction further?

If you are running high-volume reloading sessions or wish to minimize inside-neck friction and stretch, Redding offers a dedicated upgrade path. You can switch to the Redding Carbide Size Button Kit for .270 Caliber, designated by MPN 49276.

.270 Expander Button - Redding 40276

The Redding 40276 Size Button Expander is an authentic factory replacement component manufactured by Redding Reloading Equipment. Designed to mount directly onto the decapping rod assembly of Redding bottleneck rifle sizing dies, it expands and uniforms the internal case neck diameter during the press upstroke. Precision-machined from heat-treated alloy steel, this standard expander ensures reliable internal neck dimensions and uniform bullet tension for .277" projectiles across the .270 caliber cartridge family.

Key Features

Internal Neck Uniformity: Restores fired and resized cartridge necks to the required internal diameter to provide consistent neck tension on .277" diameter bullets.
Direct Factory Replacement: Fits existing Redding decapping rod assemblies to replace worn, bent, or damaged standard steel buttons.
Polished Profile: Machined with smooth transition angles to reduce case-mouth drag, brass galling, and unwanted shoulder movement during the expander pass.
Durable Construction: Built from heat-treated alloy steel to maintain precise dimensional tolerances over extended reloading cycles.

Product Specifications

Brand: Redding Reloading Equipment
Manufacturer Part Number (MPN): 40276
Expander Nominal Diameter: 0.276 inches (0.276")
Calibre Compatibility: .270 Calibre / 6.8mm bottleneck cartridges (e.g., .270 Winchester, .270 WSM, 6.8 Western)
Die Compatibility: Redding Standard Full-Length, Neck Sizing, and Type S Bushing Sizing Dies
Material: Heat-treated alloy steel
Weight: Under 30 g (<1 oz)
Operation: Manual / mechanical reloading component (non-electric)

Who is the Redding 40276 Size Button Expander for?

Handloaders maintaining Redding sizing dies — requires a nominal 0.276-inch diameter steel size button to service or restore factory Redding .270 caliber bottleneck decapping rod assemblies to original operational specifications.
Reloaders loading .270 caliber bottleneck cartridges — needs to produce uniform internal case neck tension for .277" diameter bullets across calibres including .270 Winchester, .270 WSM, and 6.8mm platforms using an expander button measuring a nominal 0.276 inches.

Less suitable for: Non-Redding dies or Redding straight-wall dies with incompatible thread patterns, reloading without inside-neck lubrication where a free-floating carbide size button kit is better suited, or expanding brass necks up from smaller calibres which requires a dedicated tapered expander button.

SKU	RD102578LP
Model #	40276
Brand	Redding
Shipping Weight	0.2000kg

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Redding 40276 Size Button Expander 270 Caliber Steel

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