Will this die set work with standard .300 Winchester Short Magnum (.300 WSM) or .300 RUM brass?

No, this die set is exclusively engineered for the .300 Remington Short Action Ultra Magnum (.300 RSAUM) cartridge. It is not compatible with standard length .300 Remington Ultra Magnum cartridges—which require RCBS Part #17601—nor is it designed for other short magnums like the .300 WSM.

What reloading presses are compatible with the RCBS 31201 die set?

The dies feature a standard 7/8"-14 thread interface, making them universally compatible with almost all single-stage and progressive reloading presses across the industry, including those from RCBS, Hornady, Lee, Lyman, Redding, and Dillon. They will not fit heavy-duty large-thread presses using 1-1/2" threads without a reducing bushing.

Does this mechanical hand tool require any Australian electrical or safety certifications like an SAA or RCM plug?

No. Because the RCBS 31201 is a purely mechanical handloading tool containing no electrical components, it has no power requirements and does not need 240V compatibility, an Australian power plug, or SAA/RCM safety certifications. It is ready for immediate out-of-the-box use in your reloading shed.

Should I use this full-length die set if I am reloading brass fired from multiple different rifles?

Yes, full-length sizing is specifically recommended if your brass has been fired from multiple firearms or if you are loading for hunting rifles where flawless chambering reliability is paramount. The sizer die brings fired brass back to SAAMI minimum dimensions and includes integrated air vent holes to prevent trapped air and excessive lube from damaging the case shoulder.

300 RSAUM Die Set - RCBS R31201

The RCBS 300 Rem SA Ultra Mag Full Length Die Set (Model: 31201 / R31201) is a precision-engineered two-die reloading system designed for processing .300 Remington Short Action Ultra Magnum (.300 RSAUM) cartridge cases. Machined from proprietary case-hardened steel, this set is built to restore fired bottleneck brass back to factory SAAMI dimensions, ensuring reliable feeding and chambering. As a purely mechanical, hand-operated tool, it requires no electrical power or localized compliance certifications, making it fully ready for use on any Australian reloading bench right out of the box.

Key Features

Full-Length Sizing Die: Resizes the entire exterior case body of fired brass back to SAAMI minimum dimensions, ensuring flawless chambering in hunting and bolt-action rifles.
Integrated Decapping and Expanding: Features an Expander-Decapping Unit that extracts spent primers and expands the inner case neck to receive a new bullet in a single stroke.
Air Vent Holes: Machined air vent holes in the sizer die prevent trapped air and excess case lubricant from causing dimples or structural damage to the cartridge shoulder.
Bullet Seater Die: Includes an adjustable seater plug to seat bullets to exact depths, alongside an integrated roll crimper that secures the bullet in place.

Product Specifications

Calibre: .300 Remington Short Action Ultra Magnum (.300 RSAUM)
Thread Interface: Standard 7/8"-14 thread (compatible with most single-stage and progressive presses)
Weight: 1.20 lbs (0.54 kg)
Package Dimensions: 6 x 5 x 2 inches (15.2 x 12.7 x 5.1 cm)
Material: Case-hardened die steel

Who is the Rcbs 300 Rem Sa Ultra Mag Full Length Die Set for?

Precision Handloaders — requiring a specialized rifle reloading die set to process fired brass back to SAAMI minimum dimensions for the .300 Remington Short Action Ultra Magnum (.300 RSAUM) cartridge, featuring a standardized 7/8"-14 thread interface to ensure direct compatibility with standard single-stage and progressive presses.
Hunters and Field Shooters — demanding absolute chambering reliability across multiple firearms by utilizing a full-length sizer die within this rifle reloading die set to compress the cartridge back to factory specifications, packaged in a compact 1.20 lbs kit.

Less suitable for: Reloaders processing standard-length .300 Remington Ultra Magnum (.300 RUM) cartridges, other short magnums like the .300 WSM, or those utilizing heavy-duty reloading presses with 1-1/2" threads, which require dedicated alternative die sets or specialized reducing bushings.

SKU	RC39219LP
Model #	R31201
Brand	Rcbs
Shipping Weight	1.0000kg

What our Customers are Saying

We Also Recommend

Primos Hunting Game Caller Randy Anderson Predator

$61.95

Lyman Trius Trap Birdshooter 2 Fully Adjustable Wi

$160.95

Allen Cascade Neoprene Gun Sling With Molded Ends

$56.95

Cci #300 Large Pistol Primers For Handgun Reloadin

$20.95

Recommended Products

Redding 80209 Die Set 45-70 Govt 3-Die Reloading K

$201.95

Rcbs R14501 416 Barrett Die Set 1 5x12 Full Length

$1,186.95

Lee Precision 90531 Carbide Full Length Sizing Die

$56.95

Redding 84215 35 Whelen Deluxe 3 Die Set For Preci

$287.95

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.

Rcbs R31201 Full Length Die Set 300 Rsaum 7/8-14 Thread

Secure Payment Methods