My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Shopping list
Your basket is empty. (0)
Basket
Newsletter Newsletter
Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Home Reloading Case Preparation Neck Turning Turning & Expander Mandrels SINCLAIR INTERNATIONAL CARBIDE EXPANDER MANDRELS Support
Enhance your reloading precision with the 7mm Carbide Expander Mandrel from Sinclair International. Perfect for neck turning! 🔧
  • SINCLAIR INTERNATIONAL 7MM (0.283") CARBIDE EXPANDER MANDREL
  • SINCLAIR INTERNATIONAL 7MM (0.283") CARBIDE EXPANDER MANDREL

SINCLAIR INTERNATIONAL CARBIDE EXPANDER MANDRELS - SINCLAIR INTERNATIONAL 7MM (0.283") CARBIDE EXPANDER MANDREL

749014469

Variations:

Enhance your reloading precision with the 7mm Carbide Expander Mandrel from Sinclair International. Perfect for neck turning! 🔧
SINCLAIR INTERNATIONAL 7MM (0.283") CARBIDE EXPANDER MANDREL
54.9 GBP 19 £54.90 *
Caliber: 284 Caliber, 7mm Diameter (in): 0.283 Product no.: 749014469
In stock
54.9 GBP 19 £54.90 *
Ask question
Enhance your reloading with the Sinclair Carbide Expander Mandrel for 17 Caliber 🔧. Achieve perfect neck tension and concentricity!
SINCLAIR INTERNATIONAL 17 CALIBER (0.171") CARBIDE EXPANDER MANDREL
54.9 GBP 1 £54.90 *
Caliber: 17 Caliber Diameter (in): 0.171 Product no.: 749014408
In stock
54.9 GBP 1 £54.90 *
Ask question
Enhance your reloading precision with the Sinclair 20 Caliber Carbide Expander Mandrel. 🛠️ Achieve perfect neck tension and concentricity!
SINCLAIR INTERNATIONAL 20 CALIBER (0.203") CARBIDE EXPANDER MANDREL
54.9 GBP 1 £54.90 *
Caliber: 20 Caliber Diameter (in): 0.203 Product no.: 749014409
In stock
54.9 GBP 1 £54.90 *
Ask question
Enhance your reloads with Sinclair's 22 Caliber Carbide Expander Mandrel. Achieve perfect neck tension and concentricity! 🔧
SINCLAIR INTERNATIONAL 22 CALIBER (0.223") CARBIDE EXPANDER MANDREL
54.9 GBP 13 £54.90 *
Caliber: 22 Caliber Diameter (in): 0.223 Product no.: 749014457
In stock
54.9 GBP 13 £54.90 *
Ask question
Enhance your reloading with Sinclair's 25 Caliber Carbide Expander Mandrel. 🔧 Achieve precise neck tension and perfect fit for optimal performance!
SINCLAIR INTERNATIONAL 25 CALIBER (0.256") CARBIDE EXPANDER MANDREL
54.9 GBP 3 £54.90 *
Caliber: 25 Caliber Diameter (in): 0.256 Product no.: 749014466
In stock
54.9 GBP 3 £54.90 *
Ask question
Enhance your reloads with Sinclair's 30 Caliber Carbide Expander Mandrel. Precision-crafted for perfect neck tension and concentricity. 🔧
SINCLAIR INTERNATIONAL 30 CALIBER (0.307") CARBIDE EXPANDER MANDREL
54.9 GBP 29 £54.90 *
Caliber: 30 Caliber Diameter (in): 0.307 Product no.: 749014470
In stock
54.9 GBP 29 £54.90 *
Ask question
Achieve precision with Sinclair's 338 Caliber Carbide Expander Mandrel. Perfect for neck turning and bullet seating. 🔧 Enhance your hand loading!
SINCLAIR INTERNATIONAL 338 CALIBER (0.337") CARBIDE EXPANDER MANDREL
54.9 GBP 29 £54.90 *
Caliber: 338 Caliber Diameter (in): 0.337 Product no.: 749014472
In stock
54.9 GBP 29 £54.90 *
Ask question
Enhance your reloading with the Sinclair 6mm Carbide Expander Mandrel. Precision-engineered for perfect neck tension and fit! 🔧
SINCLAIR INTERNATIONAL 6MM (0.242") CARBIDE EXPANDER MANDREL
54.9 GBP 19 £54.90 *
Caliber: 243 Caliber, 6mm Diameter (in): 0.242 Product no.: 749014465
In stock
54.9 GBP 19 £54.90 *
Ask question
Enhance your reloading precision with the 8mm Sinclair Carbide Expander Mandrel. 🛠️ Perfect for neck turning and bullet seating!
SINCLAIR INTERNATIONAL 8MM (0.322") CARBIDE EXPANDER MANDREL
54.9 GBP 3 £54.90 *
Caliber: 8mm, 32 Caliber Diameter (in): 0.322 Product no.: 749014471
In stock
54.9 GBP 3 £54.90 *
Ask question
Enhance your reloading with the 6.5mm Carbide Expander Mandrel from Sinclair International. Precision-engineered for perfect neck tension. 🔧
SINCLAIR INTERNATIONAL 6.5MM (0.263") CARBIDE EXPANDER MANDREL
54.9 GBP 108 £54.90 *
Caliber: 6.5mm, 264 Caliber Diameter (in): 0.263 Product no.: 749014467
In stock
54.9 GBP 108 £54.90 *
Ask question
Enhance your reloading with the Sinclair Carbide Expander Mandrel for 270 Caliber. Precision-engineered for perfect neck tension! 🔧
SINCLAIR INTERNATIONAL 270 CALIBER (0.276") CARBIDE EXPANDER MANDREL
54.9 GBP 0 £54.90 *
Caliber: 270 Caliber, 6.8mm Diameter (in): 0.276 Product no.: 749014468
Backorderable
54.9 GBP 0 £54.90 *
Ask question
54.9 54.9 11 GBP
54.9 GBP £54.90

Prices inclusive of duty & VAT.

Product no.: 749014469

Sinclair Carbide Neck Expander Mandrels are ground from solid carbide stock, which yields closer tolerances and more lubricity. Carbide is also better at resisting galling which can leave behind material and scratch the inside of your necks. The shape, finish, and size are the result of years of use and experimentation by many hand loaders. Sinclair expander mandrels are made .001" smaller than bullet diameter. Using an expander mandrel prior to neck turning sizes the case to fit the neck turning mandrels perfectly, or use prior to bullet seating to get more concentric necks and perfect neck tension. All Sinclair Mandrels are designed for use with the Sinclair Expander Die and all Sinclair Neck Turning Tools.
In stock
Be the first to rate this product
1
2
3
4
5
6
7
8
9
10+
Wish List Ask question

Variations:

Enhance your reloading precision with the 7mm Carbide Expander Mandrel from Sinclair International. Perfect for neck turning! 🔧
SINCLAIR INTERNATIONAL 7MM (0.283") CARBIDE EXPANDER MANDREL
54.9 GBP 19 £54.90 *
Caliber: 284 Caliber, 7mm Diameter (in): 0.283 Product no.: 749014469
In stock
54.9 GBP 19 £54.90 *
Ask question
Enhance your reloading with the Sinclair Carbide Expander Mandrel for 17 Caliber 🔧. Achieve perfect neck tension and concentricity!
SINCLAIR INTERNATIONAL 17 CALIBER (0.171") CARBIDE EXPANDER MANDREL
54.9 GBP 1 £54.90 *
Caliber: 17 Caliber Diameter (in): 0.171 Product no.: 749014408
In stock
54.9 GBP 1 £54.90 *
Ask question
Enhance your reloading precision with the Sinclair 20 Caliber Carbide Expander Mandrel. 🛠️ Achieve perfect neck tension and concentricity!
SINCLAIR INTERNATIONAL 20 CALIBER (0.203") CARBIDE EXPANDER MANDREL
54.9 GBP 1 £54.90 *
Caliber: 20 Caliber Diameter (in): 0.203 Product no.: 749014409
In stock
54.9 GBP 1 £54.90 *
Ask question
Enhance your reloads with Sinclair's 22 Caliber Carbide Expander Mandrel. Achieve perfect neck tension and concentricity! 🔧
SINCLAIR INTERNATIONAL 22 CALIBER (0.223") CARBIDE EXPANDER MANDREL
54.9 GBP 13 £54.90 *
Caliber: 22 Caliber Diameter (in): 0.223 Product no.: 749014457
In stock
54.9 GBP 13 £54.90 *
Ask question
Enhance your reloading with Sinclair's 25 Caliber Carbide Expander Mandrel. 🔧 Achieve precise neck tension and perfect fit for optimal performance!
SINCLAIR INTERNATIONAL 25 CALIBER (0.256") CARBIDE EXPANDER MANDREL
54.9 GBP 3 £54.90 *
Caliber: 25 Caliber Diameter (in): 0.256 Product no.: 749014466
In stock
54.9 GBP 3 £54.90 *
Ask question
Enhance your reloads with Sinclair's 30 Caliber Carbide Expander Mandrel. Precision-crafted for perfect neck tension and concentricity. 🔧
SINCLAIR INTERNATIONAL 30 CALIBER (0.307") CARBIDE EXPANDER MANDREL
54.9 GBP 29 £54.90 *
Caliber: 30 Caliber Diameter (in): 0.307 Product no.: 749014470
In stock
54.9 GBP 29 £54.90 *
Ask question
Achieve precision with Sinclair's 338 Caliber Carbide Expander Mandrel. Perfect for neck turning and bullet seating. 🔧 Enhance your hand loading!
SINCLAIR INTERNATIONAL 338 CALIBER (0.337") CARBIDE EXPANDER MANDREL
54.9 GBP 29 £54.90 *
Caliber: 338 Caliber Diameter (in): 0.337 Product no.: 749014472
In stock
54.9 GBP 29 £54.90 *
Ask question
Enhance your reloading with the Sinclair 6mm Carbide Expander Mandrel. Precision-engineered for perfect neck tension and fit! 🔧
SINCLAIR INTERNATIONAL 6MM (0.242") CARBIDE EXPANDER MANDREL
54.9 GBP 19 £54.90 *
Caliber: 243 Caliber, 6mm Diameter (in): 0.242 Product no.: 749014465
In stock
54.9 GBP 19 £54.90 *
Ask question
Enhance your reloading precision with the 8mm Sinclair Carbide Expander Mandrel. 🛠️ Perfect for neck turning and bullet seating!
SINCLAIR INTERNATIONAL 8MM (0.322") CARBIDE EXPANDER MANDREL
54.9 GBP 3 £54.90 *
Caliber: 8mm, 32 Caliber Diameter (in): 0.322 Product no.: 749014471
In stock
54.9 GBP 3 £54.90 *
Ask question
Enhance your reloading with the 6.5mm Carbide Expander Mandrel from Sinclair International. Precision-engineered for perfect neck tension. 🔧
SINCLAIR INTERNATIONAL 6.5MM (0.263") CARBIDE EXPANDER MANDREL
54.9 GBP 108 £54.90 *
Caliber: 6.5mm, 264 Caliber Diameter (in): 0.263 Product no.: 749014467
In stock
54.9 GBP 108 £54.90 *
Ask question
Enhance your reloading with the Sinclair Carbide Expander Mandrel for 270 Caliber. Precision-engineered for perfect neck tension! 🔧
SINCLAIR INTERNATIONAL 270 CALIBER (0.276") CARBIDE EXPANDER MANDREL
54.9 GBP 0 £54.90 *
Caliber: 270 Caliber, 6.8mm Diameter (in): 0.276 Product no.: 749014468
Backorderable
54.9 GBP 0 £54.90 *
Ask question

Description:

Yields Closer Tolerances and More Lubricity
Sinclair Carbide Neck Expander Mandrels are ground from solid carbide stock, which yields closer tolerances and more lubricity. Carbide is also better at resisting galling which can leave behind material and scratch the inside of your necks. The shape, finish, and size are the result of years of use and experimentation by many hand loaders. Sinclair expander mandrels are made .001" smaller than bullet diameter. Using an expander mandrel prior to neck turning sizes the case to fit the neck turning mandrels perfectly, or use prior to bullet seating to get more concentric necks and perfect neck tension. All Sinclair Mandrels are designed for use with the Sinclair Expander Die and all Sinclair Neck Turning Tools.

Top takeaways

  1. Sinclair Carbide Neck Expander Mandrels are made from solid carbide for closer tolerances and increased lubricity, reducing galling and material scratch risks.
  2. These mandrels are designed to be .001" smaller than bullet diameter for optimal sizing before neck turning or bullet seating, enhancing concentric necks and neck tension.
  3. The mandrels are compatible with the Sinclair Expander Die and all Sinclair Neck Turning Tools, tailored for .284 Caliber, 7mm with a diameter of 0.283 inches.

Attributes

  • Caliber: 284 Caliber,7mm
  • Diameter (in): 0.283
  • Delivery weight: 0.034kg
  • Shipping height: 64mm
  • Shipping width: 13mm
  • Shipping length: 64mm

Item details

Made in USA

Customers reviews

Customer ratings (0)

0 / 5

Customers also bought

Alternative items

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2025 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top
10% OFF?²
I would like to receive the Brownells newsletter regularly and be informed about offers, news, trends and promotions as well as receive requests for product reviews. This consent can be revoked at any time with effect for the future at the end of each email. Our privacy policy can be found here: https://www.brownells.co.uk/Terms-and-Conditions *Required fields ²Redeemable only once. Cannot be combined with other discount promotions. Valid until 31.12.2025. Does not apply to excluded products (see product description).