NEW 6mm ARC: What it is, Announcements, What Should I Show?

Today Hornady introduced a new rifle for the AR-15 platform called 6mm ARC (Advanced Rifle Cartridge). In this post, I’ll summarize what I know about this new cartridge, help to make an industry announcement, talk about my plans with 6mm ARC, and request your thoughts and input for content ideas!

6mm ARC is HERE!

6mm ARC quick facts:

  • It’s a 6mm cartridge similar to 6.5 Grendel, built for the AR-15 platform
  • It’s optimized for bullets in the 103 grain – 110 grain range
  • It’s got more velocity and less recoil compared to 6.5 Grendel
  • It shares the same parent case with 6.5 Grendel: The 220 Russian
  • It’s capable of launching a 6mm 108 grain projectile approximately 2800 FPS from a 24″ barrel

From the Hornady 6 ARC page:

Tested, selected and fielded by a specialized group within the U.S. DoD for its multipurpose combat rifle program, the versatile 6mm ARC does much of what larger cartridges can and everything that smaller cartridges can’t. Designed to meet the needs of the world’s toughest critics, the 6mm ARC utilizes efficient, high-BC bullets to deliver unprecedented performance from the AR-15 platform. Commercial 6mm ARC offerings will feature bullets selected to deliver ideal performance for hunting, match shooting and personal protection applications.

What’s more: It’s already SAAMI approved!

Click here to view the cartridge and chamber print on the SAAMI website

CMMG Announces AR-15s Chambered in 6mm ARC

This is GREAT news! Here’s the full press release that CMMG sent out today:

Boonville, MO – CMMG is proud to announce the addition of Hornady’s® 6mm ARC (Advanced Rifle Cartridge) to the RESOLUTE™ and ENDEAVOR™ families of rifles. Designed and engineered for accuracy and performance in the versatile AR15 platform, the 6mm ARC’s ballistic performance makes it ideal for precision shooting, hunting, military/law enforcement and recreational shooting.

The Hornady 6mm ARC is a short-action cartridge designed to push the limits. Based on the 6.5 Grendel cartridge case, the 6mm ARC was designed to achieve comparable ballistics to the AR10 308 WIN, all while operating in a 30% lighter system.

For shooters and hunters who need to reach further distances, the 6mm ARC will be available in 108gr ELD Match® (match ammo), delivering a muzzle velocity of 2750 fps and the 103gr ELD-X® (precision hunter ammo) with 2800 fps. Less felt recoil provides both shooters and hunters the ability to stay on target after making the shot and the potential for quicker follow-up shots with the AR15.

CMMG RESOLUTE™ and ENDEAVOR™ 100, 200 and 300 Series come with a rifle-length gas system on both the 16” RESOLUTE barrel and 20” ENDEAVOR barrel. This allows for the rifles to have less felt recoil and lower extraction force, reducing wear and tear.

RESOLUTE™ rifles will have a MSRP ranging from $1,049.95 to $1,649.95 (series pending) and the ENDEAVOR™ rifles with a MSRP ranging from $1,049.95 to $1,799.95 (series pending). CMMG 6mm ARC rifles will be available from CMMG’s website, stocking dealers, qualified retailer stores and their websites.

Both the RESOLUTE™ and ENDEAVOR™ rifles ship with one 10-round detachable box magazine.

Learn more about the brand-new 6mm ARC rifles from CMMG at:
About CMMG:
CMMG began in central Missouri in 2002 and quickly developed into a full-time business because of its group of knowledgeable and passionate firearms enthusiasts committed to quality and service. Its reputation was built on attention to detail, cutting edge innovation and the superior craftsmanship that comes from sourcing all their own parts. By offering high quality AR rifles, parts and accessories, CMMG’s commitment to top-quality products and professional service is as deep today as it was when it began.

For more information, visit

I’m Getting Hands-On with 6mm ARC, What Do You Want to See?

I bet you guessed it- 6mm ARC is coming here to Ultimate Reloader! I’ll be getting hands-on with one of the CMMG AR-15s, and will be evaluating 6mm ARC performance with it! My question for you: what else would you like to see related to 6mm ARC? I’m still planning out the scope! Please leave a comment.

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6 thoughts on “NEW 6mm ARC: What it is, Announcements, What Should I Show?”

  1. Not to change the subject, but have you done a comparison of
    turret presses?
    I’m not a fan of gas guns. I’m old school bolt guy. Almost all my
    shooting is bench rest. I shoot a 30br, 6br, and 22rf. I picked my
    Bergara B14r up 2 days before I saw your video, and was very
    excited to watch it. It did not disappoint. I bought the all steel
    barreled version. Living in the Wenatchee area, I haven’t had a
    chance to test ammo yet, but I’ll try the SK rifle match first.

  2. One of your custom bolt action with a super quality appropriate sized action. Also, real world effects of barrel length.

    Keep up the good work!

  3. 6ARC: Gavin, how does the new 6ARC compare to .223 Rem/5.56 NATO? How much accuracy potential is in this new round?

    I’d like to see another bolt action build for 6ARC. Compliments, BTW, on your 6 Dasher build. If you keep advancing the load for that rifle, the next stop isn’t PRS, it’s Bench Rest. Those BR guys/gals get upset if they put five rounds downrange through one hole and the hole is a little ragged around the edges. Bench Rest is the ultimate form of accuracy and precision with a rifle. And the Bench Rest round of choice is almost always a 6mm variant. Be interesting to see if 6ARC plays well with the Bench Rest crowd.

  4. I’m interested in how it compares to 224 valkyrie for target and varmint shooting. I’m fairly sure the 224v is faster but which stays supersonic longer?

  5. Could you please do a comparison between the 6mm ARC and the 6mm GT. they look identical to me. i think different shoulder angles…

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