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 Comparators SINCLAIR INTERNATIONAL BULLET COMPARATOR INSERT, 375 CALIBER (0.375") Support

Achieve precise measurements with Sinclair Bullet Comparator Inserts, crafted from stainless steel to eliminate wobble and ensure accurate ogive-to-base comparisons.

SINCLAIR INTERNATIONAL BULLET COMPARATOR INSERT, 375 CALIBER (0.375")

749000917
Variations
Filters:
Variations:

Variations:

Achieve precise measurements with Sinclair Bullet Comparator Inserts, crafted from stainless steel to eliminate wobble and ensure accurate ogive-to-base comparisons.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 375 CALIBER (0.375")
10.9 GBP 0 £10.90 *
Backorderable
Caliber: 375 Caliber (.375) Product no.: 749000917
Backorderable
10.9 GBP 0 £10.90 *
-9 %
Achieve precise bullet measurements with Sinclair Bullet Comparator Inserts, stainless steel design eliminates wobble for consistent ogive-to-base readings.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 8MM (0.323")
9.9 GBP 5 £9.90 * £10.90
In stock
Caliber: 8 mm (.323) Product no.: 749000919
In stock
9.9 GBP 5 £9.90 * £10.90
-8 %
Achieve precise measurements of bullet ogive-to-base and loaded round ogive-to-cartridge-base with Sinclair's stainless steel Bullet Comparator Inserts, eliminating wobble.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 35 CALIBER (0.358")
11.9 GBP 3 £11.90 * £12.90
In stock
Caliber: 35 Caliber (.358) Product no.: 749000920
In stock
11.9 GBP 3 £11.90 * £12.90
-9 %
Sinclair Bullet Comparator Inserts offer precise ogive-to-base measurements, eliminating wobble for consistent results, perfect for 45 caliber reloaders.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 45 CALIBER (0.458")
9.9 GBP 1 £9.90 * £10.90
In stock
Caliber: 45 Caliber (.451-.454) Product no.: 749000921
In stock
9.9 GBP 1 £9.90 * £10.90
-9 %
Sinclair Bullet Comparator Inserts offer precise ogive-to-base measurements with a stainless steel design, eliminating wobble for consistent and accurate results.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 25 CALIBER (0.257")
9.9 GBP 5 £9.90 * £10.90
In stock
Caliber: 25 Caliber (.257) Product no.: 749000922
In stock
9.9 GBP 5 £9.90 * £10.90
-9 %
Achieve precise measurements with Sinclair Bullet Comparator Inserts, designed for 270 caliber, eliminating wobble for accurate ogive-to-base comparisons.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 270 CALIBER (0.277")
9.9 GBP 3 £9.90 * £10.90
In stock
Caliber: 270 Caliber, 6.8mm Product no.: 749000923
In stock
9.9 GBP 3 £9.90 * £10.90
-7 %
Sinclair Bullet Comparator Inserts offer precise measurements with stainless steel construction, eliminating wobble for consistent ogive-to-base readings.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 7MM (0.284")
12.9 GBP 4 £12.90 * £13.90
In stock
Caliber: 284 Caliber, 7mm Product no.: 749000925
In stock
12.9 GBP 4 £12.90 * £13.90
-9 %
Achieve precise bullet measurements with Sinclair's stainless steel Bullet Comparator Inserts, designed to eliminate wobble and ensure consistency in ogive-to-base measurements.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 338 CALIBER (0.338")
9.9 GBP 9 £9.90 * £10.90
In stock
Caliber: 338 Caliber (.338) Product no.: 749000926
In stock
9.9 GBP 9 £9.90 * £10.90
-8 %
Achieve precise bullet measurements with Sinclair Bullet Comparator Inserts, designed to eliminate wobble and ensure consistent ogive-to-base results for 20 caliber bullets.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 20 CALIBER (0.204")
11.9 GBP 1 £11.90 * £12.90
In stock
Caliber: 20 Caliber (.204) Product no.: 749000927
In stock
11.9 GBP 1 £11.90 * £12.90
-7 %
Sinclair Bullet Comparator Inserts offer precise ogive-to-base measurements, eliminating wobble and ensuring consistent results for 22 caliber bullets.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 22 CALIBER (0.224")
12.9 GBP 1 £12.90 * £13.90
In stock
Caliber: 22 Caliber (.223-.224) Product no.: 749000928
In stock
12.9 GBP 1 £12.90 * £13.90
-7 %
Achieve precise measurements with Sinclair Bullet Comparator Inserts, designed to eliminate wobble and ensure consistent ogive-to-base readings for improved accuracy.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 6MM (0.243")
12.9 GBP 8 £12.90 * £13.90
In stock
Caliber: 243 Caliber, 6mm Product no.: 749000929
In stock
12.9 GBP 8 £12.90 * £13.90
-7 %
Sinclair Bullet Comparator Inserts ensure precise ogive-to-base measurements, eliminating wobble for consistent results, perfect for serious shooters and reloaders.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 6.5MM (0.264")
12.9 GBP 20 £12.90 * £13.90
In stock
Caliber: 6.5mm, 264 Caliber Product no.: 749000930
In stock
12.9 GBP 20 £12.90 * £13.90
-7 %
Achieve precise measurements with Sinclair Bullet Comparator Inserts; stainless steel design eliminates wobble, ensuring accurate ogive-to-base readings for consistent results.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 30 CALIBER (0.308")
12.9 GBP 21 £12.90 * £13.90
In stock
Caliber: 30 Caliber (.308) Product no.: 749000931
In stock
12.9 GBP 21 £12.90 * £13.90
-9 %
Enhance your precision with the Sinclair International Bullet Comparator Insert for 408 caliber, ensuring consistent measurements for optimal reloading.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 408 CALIBER (0.408")
9.9 GBP 1 £9.90 * £10.90
In stock
Caliber: 408 Caliber Product no.: 749011510
In stock
9.9 GBP 1 £9.90 * £10.90
-9 %
The Sinclair International Bullet Comparator Insert, 9.3mm, ensures precise bullet measurement for consistent reloads, enhancing accuracy and performance.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 9.3MM (0.366")
9.9 GBP 16 £9.90 * £10.90
In stock
Caliber: 9.3 mm (.366) Product no.: 749011512
In stock
9.9 GBP 16 £9.90 * £10.90
Achieve precise bullet ogive-to-base measurements with Sinclair's stainless steel Bullet Comparator Inserts, designed to eliminate wobble for consistent results.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 416 CALIBER (0.416")
10.9 GBP 0 £10.90 *
Backorderable
Caliber: 416 Caliber (.416) Product no.: 749000918
Backorderable
10.9 GBP 0 £10.90 *
The Sinclair Bullet Comparator Inserts ensure precise ogive-to-base measurements, eliminating wobble and providing consistent results for 17 caliber bullets.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 17 CALIBER (0.171")
10.9 GBP 0 £10.90 *
Backorderable
Caliber: 17 Caliber (.172) Product no.: 749000924
Backorderable
10.9 GBP 0 £10.90 *
Enhance your reloading precision with the Sinclair International 404 Caliber (0.423") Comparator Insert, designed for accurate bullet measurement and consistency.
BULLET COMPARATOR INSERTS - 404 CALIBER (0.423") COMPARATOR INSERT
Not available
Caliber: 404 Caliber Product no.: 749009372
Not available
8.9 GBP 0 £8.90 *
Enhance your reloading precision with the Sinclair International 44 Caliber (0.429") Comparator Insert, designed for accurate bullet measurement and consistent performance.
BULLET COMPARATOR INSERTS - 44 CALIBER (0.429") COMPARATOR INSERT
Not available
Caliber: 44 Caliber (.429-.430) Product no.: 749011511
Not available
9.9 GBP 0 £9.90 *
9.9 12.9 19 GBP
10.9 GBP £10.90

Prices inclusive of duty & VAT.

Product no.: 749000917

Mfr. No.: 090375

The Sinclair Bullet Comparator inserts are meant to be used with the Sinclair Bullet Comparator and Bump Gage Body. These inserts are stainless steel and machined with a taper and a short straight section to more accurately duplicate the chamber throat. This eliminates the wobble experienced with many comparators which have standard drilled holes. Our design allows you to quickly and accurately measure and compare bullet ogive-to-base as well as loaded round ogive-to-cartridge-base measurements. This measurement gives more consistent results than measuring overall lengths since the meplat (the open tip of the bullet) can very by several thousandths of an inch from bullet to bullet.
Backorderable
Be the first to rate this product
1
2
3
4
5
6
7
8
9
10+
£10.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.

100-Day Return Policy

Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.

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.
  • Accurate bullet ogive measurement
  • Eliminates wobble issues
  • Stainless steel construction
Wish List Ask question
9.9 12.9 19 GBP
Description Specification Customers reviews Accessories

SINCLAIR INTERNATIONAL BULLET COMPARATOR INSERT, 375 CALIBER (0.375")

10.9 GBP £10.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+
£10.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.

100-Day Return Policy

Description:

Enhance Your Reloading Precision with Sinclair Bullet Comparator Inserts

The Sinclair Bullet Comparator inserts are designed for use with the Sinclair Bullet Comparator and Bump Gage Body. Crafted from stainless steel, these inserts feature a taper and a short straight section that closely replicate the chamber throat, eliminating the wobble often found in standard comparators with drilled holes.

Our innovative design allows for quick and accurate measurements, enabling you to compare bullet ogive-to-base as well as loaded round ogive-to-cartridge-base measurements. This method yields more consistent results compared to measuring overall lengths, as the meplat (the open tip of the bullet) can vary by several thousandths of an inch from one bullet to another.

  • Material: Stainless steel
  • Caliber: 375 Caliber (0.375")
  • Compatibility: Sinclair Bullet Comparator and Bump Gage Body

Upgrade your reloading setup with the Sinclair Bullet Comparator Inserts for improved accuracy and consistency in your shooting performance.



Attributes

  • Caliber: 
    375 Caliber (.375)
  • Delivery weight: 0.068kg
  • Shipping height: 15mm
  • Shipping width: 74mm
  • Shipping length: 91mm

Item details

Made in USA

Customers reviews

Customer ratings (0)

0 / 5

Variations:

Achieve precise measurements with Sinclair Bullet Comparator Inserts, crafted from stainless steel to eliminate wobble and ensure accurate ogive-to-base comparisons.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 375 CALIBER (0.375")
10.9 GBP 0 £10.90 *
Backorderable
Caliber: 375 Caliber (.375) Product no.: 749000917
Backorderable
10.9 GBP 0 £10.90 *
-9 %
Achieve precise bullet measurements with Sinclair Bullet Comparator Inserts, stainless steel design eliminates wobble for consistent ogive-to-base readings.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 8MM (0.323")
9.9 GBP 5 £9.90 * £10.90
In stock
Caliber: 8 mm (.323) Product no.: 749000919
In stock
9.9 GBP 5 £9.90 * £10.90
-8 %
Achieve precise measurements of bullet ogive-to-base and loaded round ogive-to-cartridge-base with Sinclair's stainless steel Bullet Comparator Inserts, eliminating wobble.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 35 CALIBER (0.358")
11.9 GBP 3 £11.90 * £12.90
In stock
Caliber: 35 Caliber (.358) Product no.: 749000920
In stock
11.9 GBP 3 £11.90 * £12.90
-9 %
Sinclair Bullet Comparator Inserts offer precise ogive-to-base measurements, eliminating wobble for consistent results, perfect for 45 caliber reloaders.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 45 CALIBER (0.458")
9.9 GBP 1 £9.90 * £10.90
In stock
Caliber: 45 Caliber (.451-.454) Product no.: 749000921
In stock
9.9 GBP 1 £9.90 * £10.90
-9 %
Sinclair Bullet Comparator Inserts offer precise ogive-to-base measurements with a stainless steel design, eliminating wobble for consistent and accurate results.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 25 CALIBER (0.257")
9.9 GBP 5 £9.90 * £10.90
In stock
Caliber: 25 Caliber (.257) Product no.: 749000922
In stock
9.9 GBP 5 £9.90 * £10.90
-9 %
Achieve precise measurements with Sinclair Bullet Comparator Inserts, designed for 270 caliber, eliminating wobble for accurate ogive-to-base comparisons.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 270 CALIBER (0.277")
9.9 GBP 3 £9.90 * £10.90
In stock
Caliber: 270 Caliber, 6.8mm Product no.: 749000923
In stock
9.9 GBP 3 £9.90 * £10.90
-7 %
Sinclair Bullet Comparator Inserts offer precise measurements with stainless steel construction, eliminating wobble for consistent ogive-to-base readings.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 7MM (0.284")
12.9 GBP 4 £12.90 * £13.90
In stock
Caliber: 284 Caliber, 7mm Product no.: 749000925
In stock
12.9 GBP 4 £12.90 * £13.90
-9 %
Achieve precise bullet measurements with Sinclair's stainless steel Bullet Comparator Inserts, designed to eliminate wobble and ensure consistency in ogive-to-base measurements.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 338 CALIBER (0.338")
9.9 GBP 9 £9.90 * £10.90
In stock
Caliber: 338 Caliber (.338) Product no.: 749000926
In stock
9.9 GBP 9 £9.90 * £10.90
-8 %
Achieve precise bullet measurements with Sinclair Bullet Comparator Inserts, designed to eliminate wobble and ensure consistent ogive-to-base results for 20 caliber bullets.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 20 CALIBER (0.204")
11.9 GBP 1 £11.90 * £12.90
In stock
Caliber: 20 Caliber (.204) Product no.: 749000927
In stock
11.9 GBP 1 £11.90 * £12.90
-7 %
Sinclair Bullet Comparator Inserts offer precise ogive-to-base measurements, eliminating wobble and ensuring consistent results for 22 caliber bullets.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 22 CALIBER (0.224")
12.9 GBP 1 £12.90 * £13.90
In stock
Caliber: 22 Caliber (.223-.224) Product no.: 749000928
In stock
12.9 GBP 1 £12.90 * £13.90
-7 %
Achieve precise measurements with Sinclair Bullet Comparator Inserts, designed to eliminate wobble and ensure consistent ogive-to-base readings for improved accuracy.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 6MM (0.243")
12.9 GBP 8 £12.90 * £13.90
In stock
Caliber: 243 Caliber, 6mm Product no.: 749000929
In stock
12.9 GBP 8 £12.90 * £13.90
-7 %
Sinclair Bullet Comparator Inserts ensure precise ogive-to-base measurements, eliminating wobble for consistent results, perfect for serious shooters and reloaders.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 6.5MM (0.264")
12.9 GBP 20 £12.90 * £13.90
In stock
Caliber: 6.5mm, 264 Caliber Product no.: 749000930
In stock
12.9 GBP 20 £12.90 * £13.90
-7 %
Achieve precise measurements with Sinclair Bullet Comparator Inserts; stainless steel design eliminates wobble, ensuring accurate ogive-to-base readings for consistent results.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 30 CALIBER (0.308")
12.9 GBP 21 £12.90 * £13.90
In stock
Caliber: 30 Caliber (.308) Product no.: 749000931
In stock
12.9 GBP 21 £12.90 * £13.90
-9 %
Enhance your precision with the Sinclair International Bullet Comparator Insert for 408 caliber, ensuring consistent measurements for optimal reloading.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 408 CALIBER (0.408")
9.9 GBP 1 £9.90 * £10.90
In stock
Caliber: 408 Caliber Product no.: 749011510
In stock
9.9 GBP 1 £9.90 * £10.90
-9 %
The Sinclair International Bullet Comparator Insert, 9.3mm, ensures precise bullet measurement for consistent reloads, enhancing accuracy and performance.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 9.3MM (0.366")
9.9 GBP 16 £9.90 * £10.90
In stock
Caliber: 9.3 mm (.366) Product no.: 749011512
In stock
9.9 GBP 16 £9.90 * £10.90
Achieve precise bullet ogive-to-base measurements with Sinclair's stainless steel Bullet Comparator Inserts, designed to eliminate wobble for consistent results.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 416 CALIBER (0.416")
10.9 GBP 0 £10.90 *
Backorderable
Caliber: 416 Caliber (.416) Product no.: 749000918
Backorderable
10.9 GBP 0 £10.90 *
The Sinclair Bullet Comparator Inserts ensure precise ogive-to-base measurements, eliminating wobble and providing consistent results for 17 caliber bullets.
BULLET COMPARATOR INSERTS - BULLET COMPARATOR INSERT, 17 CALIBER (0.171")
10.9 GBP 0 £10.90 *
Backorderable
Caliber: 17 Caliber (.172) Product no.: 749000924
Backorderable
10.9 GBP 0 £10.90 *
Enhance your reloading precision with the Sinclair International 404 Caliber (0.423") Comparator Insert, designed for accurate bullet measurement and consistency.
BULLET COMPARATOR INSERTS - 404 CALIBER (0.423") COMPARATOR INSERT
Not available
Caliber: 404 Caliber Product no.: 749009372
Not available
8.9 GBP 0 £8.90 *
Enhance your reloading precision with the Sinclair International 44 Caliber (0.429") Comparator Insert, designed for accurate bullet measurement and consistent performance.
BULLET COMPARATOR INSERTS - 44 CALIBER (0.429") COMPARATOR INSERT
Not available
Caliber: 44 Caliber (.429-.430) Product no.: 749011511
Not available
9.9 GBP 0 £9.90 *

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