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)
Wish 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

Reloading Case Preparation Neck Turning Turning & Expander Mandrels SINCLAIR INTERNATIONAL CARBIDE EXPANDER MANDREL, 20 CALIBER (.203") Support

Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and resistance to galling, ensuring perfect neck tension and concentricity for reloaders.

SINCLAIR INTERNATIONAL CARBIDE EXPANDER MANDREL, 20 CALIBER (.203")

749014409
Variations
Filters:
Diameter (in)
0.171
0.203
0.223
0.242
0.256
0.263
0.276
0.283
0.307
0.322
0.337
Variations:

Variations:

Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and resistance to galling, ensuring perfect neck tension and concentricity for reloaders.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 20 CALIBER (.203")
64.9 GBP 4 £64.90 *
In stock
Caliber: 20 Caliber Diameter (in): 0.203 Product no.: 749014409
In stock
64.9 GBP 4 £64.90 *
-9 %
Sinclair Carbide Expander Mandrels ensure precise tolerances and enhanced lubricity, reducing galling and improving neck tension for perfect bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 17 CALIBER (.171")
49.9 GBP 2 £49.90 * £54.90
In stock
Caliber: 17 Caliber Diameter (in): 0.171 Product no.: 749014408
In stock
49.9 GBP 2 £49.90 * £54.90
-9 %
Achieve superior neck tension and concentricity with Sinclair Carbide Expander Mandrels, designed for precision and durability in hand loading.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 22 CALIBER (.223")
49.9 GBP 8 £49.90 * £54.90
In stock
Caliber: 22 Caliber Diameter (in): 0.223 Product no.: 749014457
In stock
49.9 GBP 8 £49.90 * £54.90
-9 %
Achieve precise tolerances and enhanced lubricity with Sinclair Carbide Expander Mandrels, designed for perfect neck sizing and bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 25 CALIBER (.256")
49.9 GBP 3 £49.90 * £54.90
In stock
Caliber: 25 Caliber Diameter (in): 0.256 Product no.: 749014466
In stock
49.9 GBP 3 £49.90 * £54.90
-9 %
Achieve precise tolerances and enhanced lubricity with Sinclair Carbide Expander Mandrels, perfect for neck turning and ensuring optimal neck tension before bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 30 CALIBER (.307")
49.9 GBP 13 £49.90 * £54.90
In stock
Caliber: 30 Caliber Diameter (in): 0.307 Product no.: 749014470
In stock
49.9 GBP 13 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and reduced galling, ensuring perfect neck tension and concentricity for precision hand loading.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 338 CALIBER (.337")
49.9 GBP 10 £49.90 * £54.90
In stock
Caliber: 338 Caliber Diameter (in): 0.337 Product no.: 749014472
In stock
49.9 GBP 10 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and resist galling, ensuring perfect neck tension and concentricity for your cases.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 6MM (.242")
49.9 GBP 13 £49.90 * £54.90
In stock
Caliber: 243 Caliber, 6mm Diameter (in): 0.242 Product no.: 749014465
In stock
49.9 GBP 13 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and resistance to galling, ensuring perfect neck tension and concentricity.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 7MM (.283")
49.9 GBP 13 £49.90 * £54.90
In stock
Caliber: 284 Caliber, 7mm Diameter (in): 0.283 Product no.: 749014469
In stock
49.9 GBP 13 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels ensure precise tolerances and enhanced lubricity, reducing galling and improving neck concentricity for perfect bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 8MM (.322")
49.9 GBP 2 £49.90 * £54.90
In stock
Caliber: 8mm, 32 Caliber Diameter (in): 0.322 Product no.: 749014471
In stock
49.9 GBP 2 £49.90 * £54.90
-9 %
Sinclair Carbide Neck Expander Mandrels ensure closer tolerances, enhanced lubricity, and perfect neck tension for precise bullet seating and neck turning.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 6.5MM (.263")
49.9 GBP 28 £49.90 * £54.90
In stock
Caliber: 6.5mm, 264 Caliber Diameter (in): 0.263 Product no.: 749014467
In stock
49.9 GBP 28 £49.90 * £54.90
-9 %
Achieve precise tolerances and enhanced lubricity with Sinclair Carbide Expander Mandrels, perfect for neck turning and bullet seating for optimal neck tension.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 270 CALIBER (.276")
49.9 GBP 2 £49.90 * £54.90
In stock
Caliber: 270 Caliber, 6.8mm Diameter (in): 0.276 Product no.: 749014468
In stock
49.9 GBP 2 £49.90 * £54.90
64.9 64.9 11 GBP
64.9 GBP £64.90

Prices inclusive of duty & VAT.

Product no.: 749014409

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 4 pcs. in the USA warehouse
Be the first to rate this product
1
2
3
4
5
6
7
8
9
10+
£64.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Delivery time approx. 7-14 days.

100-Day Return Policy

Delivery time approx. 7-14 days.

100-Day Return Policy
No charges until we ship
No charge:
Your credit card will not be charged when you place your order.

No commitments:
You are under no obligation until the goods are shipped. You can cancel your order at any time before shipping - free of charge.

Not until shipping:
Your credit card will only be charged once we ship your order. Not before.
  • Closer tolerances
  • Enhanced lubricity
  • Resists galling
Wish List Ask question
64.9 64.9 11 GBP
Description Specification Customers reviews Accessories

SINCLAIR INTERNATIONAL CARBIDE EXPANDER MANDREL, 20 CALIBER (.203")

64.9 GBP £64.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+
£64.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Delivery time approx. 7-14 days.

100-Day Return Policy

Description:

Enhance Your Reloading Precision with Sinclair International's Carbide Expander Mandrels

Sinclair Carbide Neck Expander Mandrels are expertly crafted from solid carbide stock, ensuring closer tolerances and enhanced lubricity. These mandrels are designed to resist galling, preventing material from being left behind and avoiding scratches on the interior of your necks.

Key Features:

  • Precision Engineering: Ground from solid carbide for superior accuracy.
  • Improved Lubricity: Ensures smoother operation during reloading.
  • Durable Design: Resists galling and wear for longevity.
  • Perfect Fit: Made .001" smaller than bullet diameter for optimal neck sizing.
  • Versatile Use: Ideal for use with Sinclair Expander Die and Neck Turning Tools.

The shape, finish, and size of these mandrels are the culmination of extensive use and experimentation by experienced hand loaders. Utilizing an expander mandrel before neck turning perfectly sizes the case to fit the neck turning mandrels, or it can be used prior to bullet seating to achieve more concentric necks and perfect neck tension.

Upgrade your reloading setup with Sinclair International's Carbide Expander Mandrels and experience the difference in precision and performance.



Attributes

  • Caliber: 
    20 Caliber
  • Diameter (in): 
    0.203
  • Delivery weight: 0.028kg
  • Shipping height: 13mm
  • Shipping width: 13mm
  • Shipping length: 51mm

Item details

Made in USA

Customers reviews

Customer ratings (0)

0 / 5

Variations:

Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and resistance to galling, ensuring perfect neck tension and concentricity for reloaders.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 20 CALIBER (.203")
64.9 GBP 4 £64.90 *
In stock
Caliber: 20 Caliber Diameter (in): 0.203 Product no.: 749014409
In stock
64.9 GBP 4 £64.90 *
-9 %
Sinclair Carbide Expander Mandrels ensure precise tolerances and enhanced lubricity, reducing galling and improving neck tension for perfect bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 17 CALIBER (.171")
49.9 GBP 2 £49.90 * £54.90
In stock
Caliber: 17 Caliber Diameter (in): 0.171 Product no.: 749014408
In stock
49.9 GBP 2 £49.90 * £54.90
-9 %
Achieve superior neck tension and concentricity with Sinclair Carbide Expander Mandrels, designed for precision and durability in hand loading.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 22 CALIBER (.223")
49.9 GBP 8 £49.90 * £54.90
In stock
Caliber: 22 Caliber Diameter (in): 0.223 Product no.: 749014457
In stock
49.9 GBP 8 £49.90 * £54.90
-9 %
Achieve precise tolerances and enhanced lubricity with Sinclair Carbide Expander Mandrels, designed for perfect neck sizing and bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 25 CALIBER (.256")
49.9 GBP 3 £49.90 * £54.90
In stock
Caliber: 25 Caliber Diameter (in): 0.256 Product no.: 749014466
In stock
49.9 GBP 3 £49.90 * £54.90
-9 %
Achieve precise tolerances and enhanced lubricity with Sinclair Carbide Expander Mandrels, perfect for neck turning and ensuring optimal neck tension before bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 30 CALIBER (.307")
49.9 GBP 13 £49.90 * £54.90
In stock
Caliber: 30 Caliber Diameter (in): 0.307 Product no.: 749014470
In stock
49.9 GBP 13 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and reduced galling, ensuring perfect neck tension and concentricity for precision hand loading.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 338 CALIBER (.337")
49.9 GBP 10 £49.90 * £54.90
In stock
Caliber: 338 Caliber Diameter (in): 0.337 Product no.: 749014472
In stock
49.9 GBP 10 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and resist galling, ensuring perfect neck tension and concentricity for your cases.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 6MM (.242")
49.9 GBP 13 £49.90 * £54.90
In stock
Caliber: 243 Caliber, 6mm Diameter (in): 0.242 Product no.: 749014465
In stock
49.9 GBP 13 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels offer superior tolerances, enhanced lubricity, and resistance to galling, ensuring perfect neck tension and concentricity.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 7MM (.283")
49.9 GBP 13 £49.90 * £54.90
In stock
Caliber: 284 Caliber, 7mm Diameter (in): 0.283 Product no.: 749014469
In stock
49.9 GBP 13 £49.90 * £54.90
-9 %
Sinclair Carbide Expander Mandrels ensure precise tolerances and enhanced lubricity, reducing galling and improving neck concentricity for perfect bullet seating.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 8MM (.322")
49.9 GBP 2 £49.90 * £54.90
In stock
Caliber: 8mm, 32 Caliber Diameter (in): 0.322 Product no.: 749014471
In stock
49.9 GBP 2 £49.90 * £54.90
-9 %
Sinclair Carbide Neck Expander Mandrels ensure closer tolerances, enhanced lubricity, and perfect neck tension for precise bullet seating and neck turning.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 6.5MM (.263")
49.9 GBP 28 £49.90 * £54.90
In stock
Caliber: 6.5mm, 264 Caliber Diameter (in): 0.263 Product no.: 749014467
In stock
49.9 GBP 28 £49.90 * £54.90
-9 %
Achieve precise tolerances and enhanced lubricity with Sinclair Carbide Expander Mandrels, perfect for neck turning and bullet seating for optimal neck tension.
CARBIDE EXPANDER MANDRELS - CARBIDE EXPANDER MANDREL, 270 CALIBER (.276")
49.9 GBP 2 £49.90 * £54.90
In stock
Caliber: 270 Caliber, 6.8mm Diameter (in): 0.276 Product no.: 749014468
In stock
49.9 GBP 2 £49.90 * £54.90

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