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Bullet Comparator Insert, 375 Caliber (0.375")
Bullet Comparator Insert, 375 Caliber (0.375")
Bullet Comparator Insert, 416 Caliber (0.416")
Bullet Comparator Insert, 8mm (0.323")
Bullet Comparator Insert, 35 Caliber (0.358")
Bullet Comparator Insert, 45 Caliber (0.458")
Bullet Comparator Insert, 25 Caliber (0.257")
Bullet Comparator Insert, 270 Caliber (0.277")
Bullet Comparator Insert, 17 Caliber (0.171")
Bullet Comparator Insert, 17 Caliber (0.171")
Bullet Comparator Insert, 7mm (0.284")
Bullet Comparator Insert, 338 Caliber (0.338")
Bullet Comparator Insert, 22 Caliber (0.224")
Bullet Comparator Insert, 6mm (0.243")
Bullet Comparator Insert, 6.5mm (0.264")
Bullet Comparator Insert, 30 Caliber (0.308")
Bullet Comparator Insert, 408 Caliber (0.408")
Bullet Comparator Insert, 9.3mm (0.366")
Bullet Comparator Insert, 20 Caliber (0.204")
Bullet Comparator Insert, 375 Caliber (0.375")
Bullet Comparator Insert, 375 Caliber (0.375")
Bullet Comparator Insert, 416 Caliber (0.416")
Bullet Comparator Insert, 8mm (0.323")
Bullet Comparator Insert, 35 Caliber (0.358")
Bullet Comparator Insert, 45 Caliber (0.458")
Bullet Comparator Insert, 25 Caliber (0.257")
Bullet Comparator Insert, 270 Caliber (0.277")
Bullet Comparator Insert, 17 Caliber (0.171")
Bullet Comparator Insert, 17 Caliber (0.171")
Bullet Comparator Insert, 7mm (0.284")
Bullet Comparator Insert, 338 Caliber (0.338")
Bullet Comparator Insert, 22 Caliber (0.224")
Bullet Comparator Insert, 6mm (0.243")
Bullet Comparator Insert, 6.5mm (0.264")
Bullet Comparator Insert, 30 Caliber (0.308")
Bullet Comparator Insert, 408 Caliber (0.408")
Bullet Comparator Insert, 9.3mm (0.366")
Bullet Comparator Insert, 20 Caliber (0.204")
None
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SINCLAIR INTERNATIONAL - Bullet Comparator Insert, 30 Caliber (0.308")

32 Reviews
Caliber
Bullet Comparator Insert, 30 Caliber (0.308")
Brownells #
749000931
MFR #
SINCLAIR COMPARATOR INSERT/30
UPC
$7.99
Coupon Code
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Specifications
Caliber:
30 Caliber
Restriction
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What is the SINCLAIR INTERNATIONAL - Bullet Comparator Insert, 30 Caliber (0.308")?

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.

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BULLET COMPARATOR INSERTS REVIEWS

3.7
32 Reviews
5 Stars
56%
4 Stars
9%
3 Stars
0%
2 Stars
13%
1 Stars
22%
Reviews Summary
The BULLET COMPARATOR INSERTS receive mixed reviews, with many users praising their machining, precision, and superior quality compared to aluminum options. However, some customers report issues with sizing, inaccuracies, and damage upon arrival, leading to dissatisfaction. Overall, while many find them effective and reliable, concerns regarding quality control and fitting persist.
What Reviewers Are Saying
Product Quality
75%
Many reviewers appreciate the precision and machining quality of the inserts, implying they outperform standard aluminum alternatives and are made with durable steel material. However, some noted quality control issues, including dings or defects in the product, which affected usability.
Sizing Issues
40%
A significant portion of reviewers highlighted problems with sizing, particularly that the holes in the inserts may be too large, leading to inconsistent measurements. This has led to frustration among users attempting to achieve accurate readings.
Usability and Accuracy
55%
While many users experienced positive outcomes with precise, repeatable measurements, others found the design problematic. Specifically, the tapered holes sometimes caused difficulties in aligning and measuring the bullets effectively, hindering satisfactory performance.
Comparison with Competitors
60%
Reviewers frequently compared the BULLET COMPARATOR INSERTS to versions made by Hornady, often recommending the Sinclair products for their higher precision. However, some users still prefer Hornady for certain measurements, indicating mixed experiences among different brands.
Customer Support and Returns
25%
A few reviewers expressed dissatisfaction with the customer service regarding returns and exchanges for defective items. This suggests that while the product has merits, the support for resolving issues could be improved.
5
Works great as always
I like these better than the other companies comparator inserts probably because of the bevel on the insert seats better on the ogive.
by MICHAEL YOUNG on June 15, 2026
Verified Purchase
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5
Nice part
It's a nicely machined part. Nice addition to my set.
by JIM MOREHEAD on February 25, 2024
Verified Purchase
Was this review helpful? 0
5
Excellent Measuring Upgrade
This is a far superior comparator insert to the standard aluminum ones. The fit on the bullet is more precise and repeatable resulting in a measurement that is consistent. I will upgrade all my inserts to this style. If you have recorded measurements using aluminum inserts you will need to remeasure using these.
by Roninco on February 12, 2022
Was this review helpful? 2
5
Excellent Measuring Upgrade
This is a far superior comparator insert to the standard aluminum ones. The fit on the bullet is more precise and repeatable resulting in a measurement that is consistent. I will upgrade all my inserts to this style. If you have recorded measurements using aluminum inserts you will need to remeasure using these.
by Roninco on February 12, 2022
Was this review helpful? 0
5
Excellent Measuring Upgrade
This is a far superior comparator insert to the standard aluminum ones. The fit on the bullet is more precise and repeatable resulting in a measurement that is consistent. I will upgrade all my inserts to this style. If you have recorded measurements using aluminum inserts you will need to remeasure using these.
by Roninco on February 12, 2022
Was this review helpful? 0
View All 32 Reviews
Customer Questions
23 Questions