BULLET COMPARATOR INSERTS Reviews & Ratings

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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3 Stars

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.

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Not a precision gauge

Ordered 3 inserts and they all had significant dings at the entry to the gauge hole, that require dressing out before they can be used. Steel appears to have been heat treated, but suspect that was done after the damage occurred.

by Rick on May 13, 2024

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Well built, but not accurate

I have the Hornady bullet comparator that I normally use. When my shooting partner and I noticed a .010 difference in our Hornady headspace comparator, I ordered the Sinclair bump gauge and the bullet comparator. The Sinclair tool is produced from quality steel and is well constructed. My issue with the tool is that on Sierra MK and Berger Juggernauts, it slides all the way down almost to the base of the bullet. I can't get repeatable results with this tool, where I can with the Hornady tool which is only made of light aluminum. The Sinclair tool does not seem to be measuring from the ogive, but more from the bullet base. As another user reviewed, when used with Comparator body, it measure 1.1 inches, rather than 1.0 like the Hornady. Because of the inaccuracy and non-repeatable readings on the same bullet, I can't continue using this.

Perhaps Too Much Taper

I was using this insert to sort 69 grain Sierra Match King bullets. The ogive on the bullet combined with the taper on the insert makes it hard to get repeatable measurements using a caliper. It's much too easy to cause the bullet to move further down into the insert while taking the measurement. The same thing happens with assembled rounds. For these bullets, the Hornady insert works better. I have a bullet sorting stand and comparators on order, I hope that is more repeatable. Also, I use a dial caliper. I can zero out the thousandth's but not the tenths of an inch. It would be nice if the comparator assembled to the insert would measure about 1.01 inches rather than 1.11 inches. It's easier to mentally subtract 1 inch from the measurement than 1.1 inches. If you use a digital caliper, it's not a problem.

Improved design, except for 1 problem.

All the details in my rating for the 6mm comparator apply here too, but I've found a problem with the .204. To get optimum groups with my Cooper M21 20 TAC, some of my loads need to be seated very deep. The Sierra 32 gr MK and Hornady 45 gr SP achieve 0.25 MOA or better, when seated 0.100" off the lands. That's right, 1/10" jump! At this depth, this new comparator runs into the mouth of the case before it can come into contact with the bullet, so it's useless. And I'm not seating these bullets past their bearing surfaces. I'd like to see the geometry of this insert changed so that the max diameter of it's tapered hole would be 0.202". Right now I measure it at 0.211". In fact all of these new Sinclair inserts should limit their maximum taper diameters to (at most) the diameter of the bearing surface of bullet they are used for.