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SINCLAIR BUMP GAGE INSERT Reviews & Ratings

SINCLAIR BUMP GAGE INSERTS

Sinclair Bump Gage Inserts are used to measure the amount of shoulder bump when setting up full length sizing dies. Our Bump Gages install in either of our comparator bodies and are machined to fit particular shoulder angles of cartridges. Rather than measuring to the datum line, these gages indicate off of the shoulder of the case to get a better, more easily assessable measurement of how much you are actually sizing your cases. We usually recommend between .001" to .002" bump for bolt action rifles and between .003" and .005" for AR-15 type rifles. Also a useful tool for keeping your brass and loaded ammunition separated if you have multiple rifles chambered for the same cartridge and checking loaded ammunition.

17 - 25-06 Remington, 270 Winchester, 280 Remington, 30-06 Springfield, 7.62 x 39 mm

20 - 243 Winchester, 260 Remington, 7 mm - 08 Remington, 7 x 64 mm Brenneke, 307 Winchester, 308 Marlin Express, 308 Winchester

20A - 338 Federal, 338 Lapua Mag

21 - 220 Swift

23 - 17 Remington, 221 Remington Fireball, 222 Remington, 222 Remington Mag, 223 Remington, 5.56 mm NATO

23A - 6.8 mm Remington SPC

25 - 264 Winchester Magnum, 225 Winchester, 6.5 x 55 mm Swedish Mauser, 7 mm Remington Magnum, 7 mm STW, 30 Remington AR, 300 Winchester Magnum, 8 mm Remington Mag, 338 Winchester Magnum

26 - 6 mm Remington

28 - 22-250 Remington, 223 WSSM (Winchester Super Short Mag), 243 WSSM (Winchester Super Short Mag)

30 - 20 Nosler, 6 mm BRX, 20 BR (Benchrest), 20 PPC, 20 Tactical, 20 Vartarg, 204 Ruger, 22 BR (Benchrest) Remington, 22 BRX, 22 PPC, 22 Nosler, 224 Valkyrie, 6 mm BR, 6 PPC, 6 mm XC, 6mm Creedmoor

30A - 300 Remington SAUM, 25 WSSM (Winchester Super Short Mag), 6.5 mm BR, 6.5 Grendel, 6.5 Creedmoor, 30 BR (Benchrest), 30 Thompson Center, 300 Ruger Compact Magnum, 300 Savage, 338 Ruger Compact Magnum

35 - 27 Nosler, 26 Nosler, 270 WSM (Winchester Short Mag), 284 Winchester, 7 mm WSM (Winchester Short Magnum), 30 Nosler, 300 WSM (Winchester Short Mag), 33 Nosler, 325 WSM (Winchester Short Mag)

40 - 22-250 Ackley Improved, 22-6mm Remington Ackley Improved, 22/30-30 Ackley Improved, 220 Ackley Improved, 223 Ackley Improved, 228 Ackley Magnum, 243 Winchester Ackley Improved, 6mm Ackley Improved, 6mm/30-30 Ackley Improved

40A - 25 Ackley Krag Short Improved, 25-3000 Ackley Improved, 257 Roberts +P Ackley Improved, 257 Roberts Ackley Improved, 338-06 Ackley Improved, 257 Ackley, 260 Ackley Improved, 280 Ackley Improved, 30-30 Ackley

45A – 45 Degree Shoulder up to 30 Caliber

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5 Stars

59%

4 Stars

3 Stars

2 Stars

1 Stars

38%

Reviews Summary

The SINCLAIR BUMP GAGE INSERT is praised for its quality and durability, particularly its stainless steel construction that promises longevity and precision. However, some users encounter issues with inconsistent measurements and a lack of fit for certain calibers, impacting their overall satisfaction. Customer support is noted as responsive and helpful.

What Reviewers Are Saying

Product Quality

60%

Many reviewers highlight the excellent build quality of the SINCLAIR BUMP GAGE INSERT. Its stainless steel material is perceived as superior to aluminum alternatives, ensuring durability and offering consistent, accurate measurements over time. This theme is mentioned by 60% of reviewers.

Calibration and Measurement Accuracy

45%

Several reviews point out that while the gage works well for some calibers, users experience issues with inaccurate readings for others. The design does not consistently produce accurate measurements, causing frustration, particularly for those with specific needs. This concern is raised by 45% of reviewers.

Compatibility and Fit

35%

Compatibility with various calibers is a common theme, where users mention that some inserts do not fit certain cases well, leading to issues like poor measurement contact or complications during use. This inconsistency in fit is noted by 35% of reviewers.

Customer Support

25%

The responsiveness and assistance offered by customer support is frequently praised, with users reporting positive experiences when resolving issues related to order entry or product inquiries. This positive note comes up for 25% of reviewers.

Ease of Use

40%

Many reviews appreciate the ease of using the gage, particularly its compatibility with other tools like Hornady's equipment. The design's focus on matching shoulder angles is also highlighted as a beneficial feature for accurate measurement. This aspect is mentioned by 40% of reviewers.

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Great product

I found the instrument very easy to use. All measurements were repeatable for each caliber I have used it on (4). I was shocked to find how much variation there was in different chambers, even from the same manufacturer. Nice be able to set up your die and know you’ve removed one element that can be detrimental to accuracy. Only take a couple minutes to get your die tuned in.

Would you recommend this? Yes, I would recommend to a friend

by Greg on March 29, 2025

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Areliable way to obtrain accurate consistent measurements

by ROBERT ROSENTHAL on December 12, 2024

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High quality

Very nicely machined and identified with engraving.

by JAMES FISHER on December 01, 2024

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Exactly what I needed

The aluminum comparator I was using was wearing out, changing the way the case was measured, the case was too long. Being stainless steel, this unit will not wear out and will give accurate measurements for many years to come. It fits into the body I already own, so that's a plus ! I'm using it now and it works great !!!!

Would you recommend this? Yes, I would recommend to a friend

by Anthony Fabiano on September 22, 2024

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Purchase

Great support. Had a problem with order entry, talked to customer support, and they fixed it on the spot. Really good people.

by CHARLES SPONAUGLE on September 06, 2023

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Solid and high quality

Having an exact shoulder angle/bevel that engages most of the surface of the shoulder ensures a much more stable, accurate and confident measurement than other that don't. Enjoy using these and never question the accuracy like I have with other similar tools.

Works well.

I used a different brand and could not get a decent consistent reading. Bought this one for my 6.5CM, and in conjunction with my Wilson full length sizing die, I got consistent readings for me to get a 0.002" bump. Thankyou Sinclair.

must have item for custom loading

like all sinclair products very well built

An absolute must for the reloader.

As always Sinclair products are top notch. This tool is an important part of reloading so as to minimize the shoulder bump on your brass. Over working the brass only serves to shorten its life span.

A perfect match!

I handload for 257 Ackley, 6.5-06 Ackley and 338-06 Ackley and the 40A works perfectly with all of them. Previously I had used the Hornady but they didn't give me the same measurements.