Sierra Bullets is widely known for their competition MatchKing bullets and their legendary performance. In this video, we put the 6mm 107 grain HPBT MatchKing to the test. 

Disclaimer

Ultimate Reloader LLC / Making with Metal Disclaimer: (by reading this article and/or watching video content you accept these terms). The content on this website (including videos, articles, ammunition reloading data, technical articles, gunsmithing and other information) is for demonstration purposes only. Do not attempt any of the processes or procedures shown or described on this website. All gunsmithing procedures should be carried out by a qualified and licensed gunsmith at their own risk. Do not attempt to repair or modify any firearms based on information on this website. Ultimate Reloader, LLC and Making With Metal can not be held liable for property or personal damage due to viewers/readers of this website performing activities, procedures, techniques, or practices described in whole or part on this website. By accepting these terms, you agree that you alone are solely responsible for your own safety and property as it pertains to activities, procedures, techniques, or practices described in whole or part on this website.

About the Sierra 6mm 107 grain HPBT MatchKing

This particular bullet is especially popular and versatile and comes in boxes of 100 or 500. 

It is ideal for long-range and competition applications in calibers like 6mm Creedmoor, 6 Dasher, 6GT, and 6mm ARC. This bullet requires a twist rate of 1:8” or faster. Both our 6GT and 6mm ARC have 1:7.5” twist barrels. Applied Ballistics gives the G1 BC of .508 and the G7 BC as .261. 

From Sierra Bullets: 

Since its introduction several years ago, the 107 grain HPBT MatchKing bullet #1570 has been used successfully in a variety of competitive disciplines. This bullet has set new records and won national championships in such diverse competitions as National Match High Power and Silhouette. These competitions all have at least one requirement in common: extreme accuracy at long range.

While they are recognized around the world for record-setting accuracy, MatchKing® and Tipped MatchKing® bullets are not recommended for most hunting applications. Although MatchKing® and Tipped MatchKing® bullets are commonly used for varmint hunting, their design will not provide the same reliable explosive expansion at equivalent velocities in varmints compared to their lightly jacketed Hornet, Blitz or Varminter counterparts.

This bullet requires a barrel twist rate of 1×8” or faster.

Lab Tests

Before doing any actual shooting, we took a close look at a sample of ten bullets. This is what we found. 

Overall, these bullets were especially consistent, particularly in weight and length when compared to my archive of lab samples. Our average weight was 106.943 grains, very close to the advertised 107 grains and one of the best weight consistency results I’ve ever seen. The more consistent the weight, the more consistent the BC. (See Bryan Litz’s books to learn more.)

The length consistency is also particularly impressive given these are hollow-point boat tails. 

6GT Results

We tested these bullets in our 6GT XLR Envy Pro build, now complete with custom Cerakote.

I conducted a simple OCW test, firing five rounds of four different charge weights of Winchester StaBALL Match ranging from 35.5 grains to 37.0 grains with Federal small rifle primers. 

All velocities measured 3,000 fps or greater, but the average group size was 0.497 MOA! I think with some more load development and possibly an EC Tuner, I could get the groups even smaller. 

6mm ARC Results

This test rifle is also a new build centered around a BAT TR action with a Bartlein 1:7.5” twist, MDT Timbr Frontier stock and Athlon Cronus 4.5-29 x 56mm FFP scope.

The .224 Valkyrie mag I’m using lends to smooth feeding. For this test, I’m shooting Hornady Precision Hunter factory ammunition and three loads I worked up: 26.7 grains, 26.9 grains, and 27.1 grains of 8208-XBR with the Sierra 107’s and Federal small rifle primers.

The first group (26.7 grains) measured 0.643”, the second group (26.9 grains) measured 0.457” and the third (27.1 grains)  measured 0.244”. All of these groups were five shots fired at 100 yards using the LongShot Target Camera System. 

Conclusion

In conclusion, the Sierra 107 grain SMK is a very consistent performer ideal for 6mm cartridges. It requires a twist of 1:8” or faster, which is easy to satisfy. Coming next are tests with the 6 Dasher and 6mm Creedmoor! (Also stay tuned for the full 6mm ARC build featured in this video!)

Get the Gear

Find Sierra 6mm 107 grain HPBT MatchKings at Creedmoor Sports!

Our target camera system: LongShot Target Camera System.

Don’t miss out on Ultimate Reloader updates, make sure you’re subscribed!

Thanks,
Gavin Gear