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 Measuring Tools Bullet Seating Depth Tools SINCLAIR INTERNATIONAL BULLET SEATING DEPTH GUIDE, AR-15 Support

Achieve precise bullet seating depths with the Sinclair Bullet Seating Depth Tool, designed for accuracy in AR-15s and other rifles using fireformed brass.
-11 %

SINCLAIR INTERNATIONAL BULLET SEATING DEPTH GUIDE, AR-15

749008968
Variations
Filters:
Diameter (in)
0.590''
0.675''
Variations:

Variations:

-11 %
Achieve precise bullet seating depths with the Sinclair Bullet Seating Depth Tool, designed for accuracy in AR-15s and other rifles using fireformed brass.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, AR-15
15.9 GBP 2 £15.90 * £17.90
In stock
Action Fit: AR-15 Product no.: 749008968
In stock
15.9 GBP 2 £15.90 * £17.90
Achieve precise bullet seating depth with the Sinclair Tool, designed for 17 to 22 caliber rifles, ensuring accuracy with fireformed brass and compatible with various actions.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.590" BULLET SEATING DEPTH GUIDE
13.9 GBP 1 £13.90 *
In stock
Action Fit: CZ 527, Kimber 84M, Sako AII, Sako L579 Diameter (in): 0.590'' Product no.: 749001238
In stock
13.9 GBP 1 £13.90 *
-10 %
Achieve precise bullet seating depth with the Sinclair Bullet Seating Depth Tool, featuring stainless steel construction and compatibility with various rifle types.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GAUGE WITH STANDARD GUIDE
36.9 GBP 1 £36.90 * £40.90
In stock
Product no.: 749004650
In stock
36.9 GBP 1 £36.90 * £40.90
-11 %
The Sinclair Bullet Seating Depth Tool ensures precise cartridge overall length for optimal accuracy in your AR-308, making reloading easier and more efficient.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, AR-308
24.9 GBP 1 £24.90 * £27.90
In stock
Action Fit: AR-10 Product no.: 749008962
In stock
24.9 GBP 1 £24.90 * £27.90
-11 %
Achieve precise bullet seating depth with the Sinclair Bullet Seating Depth Tool, compatible with most rifles and crafted from polished stainless steel for durability.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, 0.690" DIAMETER
15.9 GBP 1 £15.90 * £17.90
In stock
Product no.: 749000885
In stock
15.9 GBP 1 £15.90 * £17.90
-14 %
Achieve unparalleled accuracy with the Sinclair Bullet Seating Depth Tool, crafted from polished stainless steel for precise measurements in various rifle calibers.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, 0.675" DIAMETER
17.9 GBP 0 £17.90 * £20.90
Not available
Action Fit: Kimber 8400, Sako AIII, Sako AIV, Sako L61, Tikka, Weatherby Vanguard, Howa 1500 Diameter (in): 0.675'' Product no.: 749001230
Not available
17.9 GBP 0 £17.90 * £20.90
The Sinclair Bullet Seating Depth Tool ensures precise measurements for optimal accuracy in handloading, compatible with most rifles and includes a Delrin action guide.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.785" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Sig Sauer Diameter (in): 0.785'' Product no.: 749001231
Not available
12.9 GBP 0 £12.90 *
Achieve precision with the Sinclair Bullet Seating Depth Tool, crafted from polished stainless steel for accurate measurements across various rifle calibers.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.825" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Steyr SBS, Steyr Scout Diameter (in): 0.825'' Product no.: 749001232
Not available
16.9 GBP 0 £16.90 *
Achieve unparalleled accuracy with the Sinclair Bullet Seating Depth Tool, crafted from stainless steel for precise measurements in various calibers.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.870" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: BBR, Hall, Millennium, RPA Diameter (in): 0.870'' Product no.: 749001233
Not available
13.9 GBP 0 £13.90 *
Achieve precise measurements with the Sinclair Bullet Seating Depth Tool, crafted from polished stainless steel for accuracy with various calibers and rifles.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.555" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Cooper 21, Cooper 38, Sako A1, Sako L46, Sako Vixen Diameter (in): 0.555'' Product no.: 749001236
Not available
15.9 GBP 0 £15.90 *
The Sinclair Bullet Seating Depth Tool ensures precise bullet seating for Sako TRG and Steyr rifles, enhancing accuracy and consistency in your reloads.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.740" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Hall Express, Sako TRG, Steyr L, Steyr M, Steyr SSG Product no.: 749011665
Not available
14.9 GBP 0 £14.90 *
13.9 36.9 11 GBP
-11 %
MSRP £17.90
15.9 GBP £15.90

Prices inclusive of duty & VAT.

Product no.: 749008968

Mfr. No.: 300506

The Sinclair Bullet Seating Depth Tool has been used for decades by handloaders seeking the most accuracy out of their rifles. Our newest model is made from one fourth inch ground and polished stainless steel with one end turned down for use with 17 and 20 caliber rifles and the other end used for 22 caliber and up. This tool helps you determine the length of a loaded round touching the rifling. The Sinclair Seating Depth Tool will work with most bolt action, single shot and AR type rifles. The tool includes a Delrin action guide suitable for most bolt-action rifles (0.690” Diameter fits Remingtons, Savages, Winchesters, and many Rugers). For the most accurate measurement, the Sinclair Bullet Seating Depth Tool uses your fireformed brass and bullets so you can expect an exact measurement, every time. Also available are guides use in AR-15's, AR-10's, and Tubb's 2000's. The guide is a little different than our standard bolt-action guides. This guide inserts into the back of the upper receiver (with the bolt removed). The tool is then used as normal. For best results couple this tool with our Bullet Comparators and a good set of calipers to get repeatable and precise Base-To-Ogive measurements.
In stock 2 pcs. in the USA warehouse
4.8/5 - 10 Customers
1
2
3
4
5
6
7
8
9
10+
-11 %
MSRP £17.90
£15.90

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.
  • Precision measurement for accuracy
  • Compatible with various rifles
  • Durable stainless steel construction
Wish List Ask question
13.9 36.9 11 GBP
Description Specification Customers reviews Accessories

SINCLAIR INTERNATIONAL BULLET SEATING DEPTH GUIDE, AR-15

-11 %
MSRP £17.90
15.9 GBP £15.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+
-11 %
MSRP £17.90
£15.90

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:

Achieve unparalleled accuracy with the Sinclair Bullet Seating Depth Tool!

The Sinclair Bullet Seating Depth Tool has been a trusted companion for handloaders for decades, designed to maximize the accuracy of your rifles. Our latest model is crafted from one fourth inch ground and polished stainless steel, featuring:

  • One end turned down for use with 17 and 20 caliber rifles
  • The other end suitable for 22 caliber and up

This essential tool allows you to determine the length of a loaded round that touches the rifling, ensuring precision in your reloading process. The Sinclair Seating Depth Tool is compatible with most bolt action, single shot, and AR type rifles.

Included with the tool is a Delrin action guide that fits most bolt-action rifles (0.690” Diameter fits Remingtons, Savages, Winchesters, and many Rugers). For the most accurate measurements, the Sinclair Bullet Seating Depth Tool utilizes your fireformed brass and bullets, guaranteeing an exact measurement every time.

Additionally, guides for AR-15's, AR-10's, and Tubb's 2000's are also available. This guide is slightly different from our standard bolt-action guides, as it inserts into the back of the upper receiver (with the bolt removed), allowing you to use the tool as normal.

For optimal results, we recommend pairing this tool with our Bullet Comparators and a reliable set of calipers to achieve repeatable and precise Base-To-Ogive measurements.



Attributes

  • Action Fit: 
    AR-15
  • Diameter (in): -
  • Delivery weight: 0.023kg
  • Shipping height: 1mm
  • Shipping width: 83mm
  • Shipping length: 146mm

Item details

Made in USA

Customers reviews

Customer ratings (10)

4.8 / 5
Definitely recommended

Brownells USA Money well spent 29/04/2017

This product is simple and made from good materials. The first time I used it I shot a 0.165" group at 100 yards. That's pretty good for a 35 caliber hunting rifle. My load development consisted of seven rounds. Two charge weights. One fouler. Two three shot groups. The second group was money.

Definitely recommended

Brownells USA Works great! 18/12/2013

I bought this to use on my AR-10 and it worked just fine with 175g Sierra Match King BTHP bullets. I also bought the AR-10 insert. I will be using this on my new bolt gun to achieve proper seating depth. Great product!

Variations:

-11 %
Achieve precise bullet seating depths with the Sinclair Bullet Seating Depth Tool, designed for accuracy in AR-15s and other rifles using fireformed brass.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, AR-15
15.9 GBP 2 £15.90 * £17.90
In stock
Action Fit: AR-15 Product no.: 749008968
In stock
15.9 GBP 2 £15.90 * £17.90
Achieve precise bullet seating depth with the Sinclair Tool, designed for 17 to 22 caliber rifles, ensuring accuracy with fireformed brass and compatible with various actions.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.590" BULLET SEATING DEPTH GUIDE
13.9 GBP 1 £13.90 *
In stock
Action Fit: CZ 527, Kimber 84M, Sako AII, Sako L579 Diameter (in): 0.590'' Product no.: 749001238
In stock
13.9 GBP 1 £13.90 *
-10 %
Achieve precise bullet seating depth with the Sinclair Bullet Seating Depth Tool, featuring stainless steel construction and compatibility with various rifle types.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GAUGE WITH STANDARD GUIDE
36.9 GBP 1 £36.90 * £40.90
In stock
Product no.: 749004650
In stock
36.9 GBP 1 £36.90 * £40.90
-11 %
The Sinclair Bullet Seating Depth Tool ensures precise cartridge overall length for optimal accuracy in your AR-308, making reloading easier and more efficient.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, AR-308
24.9 GBP 1 £24.90 * £27.90
In stock
Action Fit: AR-10 Product no.: 749008962
In stock
24.9 GBP 1 £24.90 * £27.90
-11 %
Achieve precise bullet seating depth with the Sinclair Bullet Seating Depth Tool, compatible with most rifles and crafted from polished stainless steel for durability.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, 0.690" DIAMETER
15.9 GBP 1 £15.90 * £17.90
In stock
Product no.: 749000885
In stock
15.9 GBP 1 £15.90 * £17.90
-14 %
Achieve unparalleled accuracy with the Sinclair Bullet Seating Depth Tool, crafted from polished stainless steel for precise measurements in various rifle calibers.
SINCLAIR BULLET SEATING DEPTH TOOL - BULLET SEATING DEPTH GUIDE, 0.675" DIAMETER
17.9 GBP 0 £17.90 * £20.90
Not available
Action Fit: Kimber 8400, Sako AIII, Sako AIV, Sako L61, Tikka, Weatherby Vanguard, Howa 1500 Diameter (in): 0.675'' Product no.: 749001230
Not available
17.9 GBP 0 £17.90 * £20.90
The Sinclair Bullet Seating Depth Tool ensures precise measurements for optimal accuracy in handloading, compatible with most rifles and includes a Delrin action guide.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.785" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Sig Sauer Diameter (in): 0.785'' Product no.: 749001231
Not available
12.9 GBP 0 £12.90 *
Achieve precision with the Sinclair Bullet Seating Depth Tool, crafted from polished stainless steel for accurate measurements across various rifle calibers.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.825" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Steyr SBS, Steyr Scout Diameter (in): 0.825'' Product no.: 749001232
Not available
16.9 GBP 0 £16.90 *
Achieve unparalleled accuracy with the Sinclair Bullet Seating Depth Tool, crafted from stainless steel for precise measurements in various calibers.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.870" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: BBR, Hall, Millennium, RPA Diameter (in): 0.870'' Product no.: 749001233
Not available
13.9 GBP 0 £13.90 *
Achieve precise measurements with the Sinclair Bullet Seating Depth Tool, crafted from polished stainless steel for accuracy with various calibers and rifles.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.555" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Cooper 21, Cooper 38, Sako A1, Sako L46, Sako Vixen Diameter (in): 0.555'' Product no.: 749001236
Not available
15.9 GBP 0 £15.90 *
The Sinclair Bullet Seating Depth Tool ensures precise bullet seating for Sako TRG and Steyr rifles, enhancing accuracy and consistency in your reloads.
SINCLAIR BULLET SEATING DEPTH TOOL - 0.740" BULLET SEATING DEPTH GUIDE
Not available
Action Fit: Hall Express, Sako TRG, Steyr L, Steyr M, Steyr SSG Product no.: 749011665
Not available
14.9 GBP 0 £14.90 *

Customers also bought

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