What bore diameter and calibres is the Redding 40307 size button designed for?

The Redding 40307 features a .308-inch bore diameter and is specifically engineered for 30 calibre bottleneck cartridges such as .308 Winchester, .30-06 Springfield, and .300 Win Mag. It is designed to ensure proper internal case neck dimensions for optimal projectile tension during reloading.

Is this size button compatible with all Redding 30 calibre dies?

No, while it fits standard Redding full-length and neck-sizing dies using new style decapping rod assemblies, it is strictly incompatible with Redding Competition Bushing Dies. Furthermore, it is not suitable for .311 to .312-inch bore cartridges like .303 British or 7.62x39mm.

Does the Redding 40307 require any special lubrication during use on the reloading bench?

Yes, because this size button is constructed from standard heat-treated alloy steel, it requires proper inside-neck case lubrication prior to sizing. Applying suitable case neck lube prevents excessive friction, brass stretching, and unwanted case neck runout.

What should I do if I want to avoid using case neck lubrication for high-volume reloading?

If you are processing large batches of brass and wish to eliminate the need for inside-neck lubrication, Redding recommends upgrading to their Carbide Size Button Kit, designated as Part #49307. For general steel maintenance, pairing this component with the appropriate Redding decapping rod assembly like the #25307 ensures seamless setup.

Are there any electrical or regulatory compliance requirements for this component in Australia?

No, as a purely mechanical firearm reloading accessory with zero electrical components, regulatory requirements such as 240V compatibility, AU plugs, and SAA or RCM certifications do not apply. It can be freely purchased and used by Australian handloaders, target shooters, and hunters without special licensing.

Redding 40307 Size Button - Redding 40307

The Redding 40307 30 Caliber (.308 Bore) New Style Steel Size Button is an OEM replacement expander designed for Redding bottleneck rifle sizing dies. Machined from heat-treated alloy steel, it threads onto Redding new-style decapping rod assemblies to expand cartridge case necks to the correct internal dimension (.307" nominal diameter) as the case is drawn out of the sizing die, ensuring uniform projectile neck tension for standard .308" bore rifle cartridges.

Key Features

Internal Neck Expansion: Expands cartridge case necks to correct internal tolerances, providing precise neck tension for .308" diameter projectiles.
Heat-Treated Steel Construction: Precision-machined, hand-finished, and hardened alloy steel build provides consistent dimensional integrity under standard reloading press forces.
New Style Thread Compatibility: Threads directly onto Redding new-style decapping rod assemblies found in standard full-length, neck-sizing, and Type-S Bushing dies.
Factory OEM Fit: Restores factory sizing specifications when replacing worn, damaged, or misplaced expander buttons on compatible Redding die sets.

Specifications

Manufacturer Part Number (MPN): 40307
Calibre Compatibility: .30 Calibre / 7.62 mm
Bore Diameter: .308" (7.82 mm)
Nominal Expander Diameter: .307" (7.80 mm)
Material: Heat-treated alloy steel
Packaged Weight: ~20.9 g (0.10 lbs)
Packaged Dimensions: ~50 mm (L) × 8 mm (W) × 8 mm (H)
Die Compatibility: Redding standard Full-Length, Neck-Sizing, and Type-S Bushing dies
Lubrication Requirement: Inside case neck lubrication required

Who is the Redding 40307 30 Caliber Size Button for?

Handloaders reloading .30-calibre cartridges — requires the standard .308 inch bore diameter sizing capability to ensure correct bullet release tension on brass for .308 Winchester, .30-06 Springfield, and .300 Win Mag cartridges using this reloading die size button.
Target shooters and hunters maintaining Redding dies — replaces damaged or worn expanders with an exact OEM new style threaded profile to maintain dimensional consistency across .308 inch bore sizing setups without replacing the complete die assembly.

Less suitable for: Reloaders running .311 inch to .312 inch bore cartridges such as .303 British or 7.62x39mm Russian, which require dedicated .312" expander buttons, or those using Redding Competition Bushing Dies which do not accept standard expander size buttons.

SKU	RD102711LP
Model #	40307
Brand	Redding
Shipping Weight	0.2000kg

What our Customers are Saying

We Also Recommend

Lee Breech Lock Challenger Kit Iii - With Auto Be

$414.95

Sellier & Bellot 300 Winchester Magnum Unprimed Br

$57.95

A-zoom Precision 357 Magnum Metal Snap Caps Solid

$53.95

A-zoom Perfect 45 Acp Striker Snap Caps Centering

Don't pay $22.95 $15.00 34.64% OFF

Others Also Bought

Redding Big Boss Single Stage Press Pro-pak Reload

$805.95

Hornady Bullet Puller Collet #11 410cal

$34.95

Hornady 393299 Unique Case Lube All Natural Waterp

$15.95

Recommended Products

Lee Precision 90847 Carbide Sizer Factory Crimp Di

$39.95

Redding 84125 257 Roberts Deluxe 3-Die Set 7/8"-14

$231.95

Rcbs R39865 Neck Expander Plug 308 Calibre Reloadi

$50.95

Redding 32242 Decapping Rod Assembly 6mm Br 243 Ws

$44.95

Welcome to Xhunter Australia. By accessing and using our website (www.xhunter.com.au) and purchasing from our online store, you agree to be bound by the following Terms and Conditions. Please read them carefully before proceeding.

1. Eligibility

By agreeing to these Terms and Conditions, you confirm that:

• You are at least 18 years of age.
• You are legally capable of entering into a binding contract under Australian law.
• You will not purchase any restricted or controlled items unless legally permitted to do so.

2. Product Information

• All products listed are subject to availability.
• Product descriptions, specifications, and pricing are subject to change without notice.
• We make every effort to display products accurately, although we do not guarantee that all images or content are error-free.

3. Orders and Payments

• All orders are subject to acceptance and confirmation.
• Prices are in AUD and include GST unless otherwise stated.
• We reserve the right to cancel or refuse any order at our sole discretion.
• Full payment is required before dispatch.

4. Authority to Leave (ATL) and Delivery

• By default, all orders are shipped with Authority to Leave (ATL).
• If you require Signature on Delivery, please contact us prior to purchasing. Additional charges apply.
• If an order is returned to us due to failed delivery or non-receipt when ATL is not permitted, a $25 return processing fee must be paid before reshipment or refund.

5. Returns and Refunds

• Please refer to our full Returns Policy on the website.
• Returned items must be in original, resalable condition unless faulty.
• A restocking fee may apply if an item is not in reselling condition.
• Change-of-mind returns may not be accepted for clearance or custom-ordered items.

6. Firearms and Restricted Items

• You must comply with all relevant State and Federal laws for regulated products.
• You are responsible for ensuring proper licences and permits are held.
• We reserve the right to request proof of eligibility before dispatch.

7. Limitation of Liability

• Xhunter Australia is not liable for direct or indirect losses arising from the use or misuse of products.
• We are not responsible for any unauthorised modifications or incorrect application of products.

8. Manufacturer Warranty Support

Some products sold by Xhunter Australia include a manufacturer’s warranty (for example, limited lifetime warranties). These warranties are provided solely by the manufacturer and are separate from the consumer guarantees under Australian Consumer Law.

Where a manufacturer provides a warranty:

A. The warranty is offered and honoured by the manufacturer, not by Xhunter Australia, unless expressly stated otherwise.
B. Customers may be required to contact the manufacturer directly and comply with their warranty process, which may include overseas product assessment.
C. Proof of purchase is required to lodge a manufacturer warranty claim.
D. Assistance provided by Xhunter Australia in lodging warranty claims is a goodwill service only and does not imply liability for warranty outcomes or decisions.

Nothing in this clause limits your rights under Australian Consumer Law.
Xhunter Australia remains responsible for providing legally required remedies for products that fail to meet the consumer guarantees of acceptable quality, fitness for purpose, and reasonable durability.

9. Privacy

Your personal information is collected, used, and stored in accordance with our Privacy Policy.

10. Intellectual Property

All text, graphics, logos, and images on this website remain the property of Xhunter Australia and are protected by copyright laws.

11. Amendments

We may update or modify these Terms and Conditions at any time without prior notice. Continued use of our site constitutes acceptance of any updated Terms.

12. Governing Law

These Terms and Conditions are governed by the laws of Victoria, Australia. Any disputes will be handled exclusively by the courts of Victoria.

13. 18+ Age Requirement

By placing an order, you confirm that you are at least 18 years of age and legally entitled to purchase the products ordered. We may cancel any order that breaches this requirement.

Redding 40307 Size Button 30 Caliber 308 Bore Steel

Secure Payment Methods