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

Gunsmith Tools Barrel Tools Reamers Centerfire Reamers MANSON PRECISION BELTED CARTRIDGE FINISH REAMER, .300 WINCHESTER Support

.300 Winchester finish reamer by Manson Precision delivers outstanding accuracy with M7 steel, solid pilots, and customizable throating for precise chambering.
-9 %

MANSON PRECISION BELTED CARTRIDGE FINISH REAMER, .300 WINCHESTER

513050380
Variations
Filters:
Variations:

Variations:

-9 %
.300 Winchester finish reamer by Manson Precision delivers outstanding accuracy with M7 steel, solid pilots, and customizable throating for precise chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .300 WINCHESTER
239.9 GBP 3 £239.90 * £264.90
In stock
Cartridge: 300 Winchester Magnum Style: Belted Magnum Product no.: 513050380
In stock
239.9 GBP 3 £239.90 * £264.90
-9 %
Achieve unmatched accuracy with Manson Precision's 7mm Remington Finish Reamer, crafted from M7 steel with integral throater for custom chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, 7MM REMINGTON
239.9 GBP 2 £239.90 * £264.90
In stock
Cartridge: 7 mm Remington Magnum Style: Belted Magnum Product no.: 513050290
In stock
239.9 GBP 2 £239.90 * £264.90
-11 %
.300 Weatherby Finish Reamer by Manson Precision offers unmatched accuracy with M7 steel construction, integral throater, and solid pilots for custom chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .300 WEATHERBY
254.9 GBP 1 £254.90 * £284.90
In stock
Cartridge: 300 Weatherby Magnum Style: Belted Magnum Product no.: 513050560
In stock
254.9 GBP 1 £254.90 * £284.90
.257 Weatherby Finish Reamer by Manson Precision offers superb accuracy, integral throater, solid pilots, and is crafted from durable M7 steel for precise chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .257 WEATHERBY
284.9 GBP 0 £284.90 *
Backorderable
Cartridge: 257 Weatherby Magnum Style: Belted Magnum Product no.: 513050520
Backorderable
284.9 GBP 0 £284.90 *
-11 %
.300 H&H MAG Finish Reamer by Manson Precision ensures precise chambering with M7 steel construction, integral throater, and solid pilots for outstanding accuracy.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .300 H&H MAG
169.9 GBP 1 £169.90 * £189.90
In stock
Cartridge: 300 H&H Magnum Style: Belted Magnum Product no.: 513050370
In stock
169.9 GBP 1 £169.90 * £189.90
.338 Winchester Finish Reamer by Manson Precision offers superb accuracy, crafted from M7 steel with integral throater and solid pilots for precise chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .338 WINCHESTER
Not available
Cartridge: 338 Winchester Magnum Style: Belted Magnum Product no.: 513050460
Not available
284.9 GBP 0 £284.90 *
169.9 284.9 6 GBP
-9 %
MSRP £264.90
239.9 GBP £239.90

Prices inclusive of duty & VAT.

Product no.: 513050380

Mfr. No.: F300WIN

Engineered and ground by one of the most respected names in firearms reamers, Dave Manson. Superb quality reamers made to SAAMI specifications, ground from M7 steel to cut precise chambers capable of outstanding accuracy. Finish Chambering Reamers feature integral throater and solid, fixed pilots. Throating Reamers let you customize a chambering job for non-standard bullets or additional freebore length. Available as finish reamers unless listed otherwise.
In stock 3 pcs. in the USA warehouse
5/5 - 2 Customers
1
2
3
4
5
6
7
8
9
10+
-9 %
MSRP £264.90
£239.90

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.
  • Exceptional accuracy and precision
  • Customizable for non-standard bullets
  • Durable M7 high-speed steel
Wish List Ask question
169.9 284.9 6 GBP
Description Specification Customers reviews Accessories

MANSON PRECISION BELTED CARTRIDGE FINISH REAMER, .300 WINCHESTER

-9 %
MSRP £264.90
239.9 GBP £239.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+
-9 %
MSRP £264.90
£239.90

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:

Exceptional Precision for Your Firearm Needs

Introducing the Belted Cartridge Finish Reamer from Manson Precision, specifically designed for the .300 Winchester. Crafted by renowned gunsmith Dave Manson, these reamers are engineered to provide unparalleled accuracy and quality in chambering.

Product Features

  • Outstanding Quality: Manufactured to SAAMI specifications for consistent performance.
  • Superior Materials: Made from M7 high-speed steel, ensuring durability and precision.
  • Design: Features a solid pilot and six straight flutes for efficient cutting.
  • Versatile Use: Finish Chambering Reamers come with integral throater and solid, fixed pilots, allowing customization for non-standard bullets or additional freebore length.
  • Specifications:
    • Rimfire reamers have a 1/4" (6.3mm) diameter round shank.
    • Centerfire reamers feature a 3/8" (9.5mm) square drive shank.
    • .50 BMG reamers have a 1/2" round shank.
    • Pistol reamers available with barrel pilot diameter for semi-auto and single shot pistols.
    • .38 Super Nonte headspaces on case mouth.

Choose the Belted Cartridge Finish Reamer for your next gunsmithing project and experience the quality and accuracy that only Manson Precision can deliver.



Attributes

  • Cartridge: 
    300 Winchester Magnum
  • Style: 
    Belted Magnum
  • Delivery weight: 0.091kg
  • Shipping height: 18mm
  • Shipping width: 20mm
  • Shipping length: 155mm

Item details

Made in USA

Customers reviews

Customer ratings (2)

5 / 5
Definitely recommended

Brownells USA Just cut the best chamber...! 09/08/2012

Just cut the best chamber I have ever see in my 40 years of gunsmithing.... Thanks Brownells,from Australia.

Definitely recommended

Brownells USA Good Reamer 08/05/2012

Very good reamer. Cut like a surgical tool.

Variations:

-9 %
.300 Winchester finish reamer by Manson Precision delivers outstanding accuracy with M7 steel, solid pilots, and customizable throating for precise chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .300 WINCHESTER
239.9 GBP 3 £239.90 * £264.90
In stock
Cartridge: 300 Winchester Magnum Style: Belted Magnum Product no.: 513050380
In stock
239.9 GBP 3 £239.90 * £264.90
-9 %
Achieve unmatched accuracy with Manson Precision's 7mm Remington Finish Reamer, crafted from M7 steel with integral throater for custom chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, 7MM REMINGTON
239.9 GBP 2 £239.90 * £264.90
In stock
Cartridge: 7 mm Remington Magnum Style: Belted Magnum Product no.: 513050290
In stock
239.9 GBP 2 £239.90 * £264.90
-11 %
.300 Weatherby Finish Reamer by Manson Precision offers unmatched accuracy with M7 steel construction, integral throater, and solid pilots for custom chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .300 WEATHERBY
254.9 GBP 1 £254.90 * £284.90
In stock
Cartridge: 300 Weatherby Magnum Style: Belted Magnum Product no.: 513050560
In stock
254.9 GBP 1 £254.90 * £284.90
.257 Weatherby Finish Reamer by Manson Precision offers superb accuracy, integral throater, solid pilots, and is crafted from durable M7 steel for precise chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .257 WEATHERBY
284.9 GBP 0 £284.90 *
Backorderable
Cartridge: 257 Weatherby Magnum Style: Belted Magnum Product no.: 513050520
Backorderable
284.9 GBP 0 £284.90 *
-11 %
.300 H&H MAG Finish Reamer by Manson Precision ensures precise chambering with M7 steel construction, integral throater, and solid pilots for outstanding accuracy.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .300 H&H MAG
169.9 GBP 1 £169.90 * £189.90
In stock
Cartridge: 300 H&H Magnum Style: Belted Magnum Product no.: 513050370
In stock
169.9 GBP 1 £169.90 * £189.90
.338 Winchester Finish Reamer by Manson Precision offers superb accuracy, crafted from M7 steel with integral throater and solid pilots for precise chambering.
BELTED CARTRIDGE FINISH REAMER - BELTED CARTRIDGE FINISH REAMER, .338 WINCHESTER
Not available
Cartridge: 338 Winchester Magnum Style: Belted Magnum Product no.: 513050460
Not available
284.9 GBP 0 £284.90 *

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