Hornady 6mm ARC "New" cartridge

[Kimber.204]

https://www.hornady.com/6mmARC#!/

Looks like Hornady legitimized the 6mm AR (6mm Grendel) cartridge.
Maybe someone who shoots a 6mm AR can snag a box of 6mm ARC and compare them for everyone sometime.

 

[topsail86]

If I remember correctly, the shoulder falls somewhere between the PPC and the Grendel.
1.12 vs 1.145 with the Grendel/6mmAR

 

[Kurz]

Here is the SAAMI drawing:



According to the caption above, the metric head diameter dimension is a typo. They must have amended it since my calculator agrees with the dimension as printed above.

This is the link to the SAAMI cartridge and chamber drawings:

https://saami.org/wp-content/uploads/2020/03/6mm-ARC-Public-Introduction.pdf

Quoted:

The 6mm ARC is a rimless .243 caliber cartridge. Judging by the case head dimensions and the Maximum Average Pressure (MAP) of 52,000 psi, it is based on the .220 Russian case (like the 6.5 Grendel or 6mm PPC). At first glance, the 30-degree shoulder angle and the shoulder diameter of .4301″ may make you think that 6mm ARC is a necked down 6.5 Grendel, however, the length to shoulder is 1.1207″ which is shorter than 6.5 Grendel’s 1.1507″ (and longer than 6mm PPC’s 1.075″).

The maximum cartridge overall length of 2.26″ (57.4mm) is identical to the max COAL of .223 Remington which means 6mm ARC is designed to be an AR cartridge. The case length of 1.49″ results in a lot of bullet space (.77″ or 3.16 calibers) which will allow loading projectiles with very long ogives and great external ballistic performance. The SAAMI drawing states a muzzle velocity of 2,700 fps for 108-grain bullets.

243 caliber cartridges based on the .220 Russian case have been successfully used by competition shooters with the most popular of them probably being the 6mm PPC. There are several variations of 6mm PPC in the CIP standards, however, oddly enough, neither 6mm PPC nor any of its siblings are standardized by SAAMI. That being said, the 6mm ARC looks like an attempt to have a SAAMI standard cartridge of this very successful case and caliber combination.

https://www.thefirearmblog.com/blog/2020/03/20/6mm-advanced-rifle-cartridge-6mm-arc/

Charts and graphs for ammunition:
https://gununiversity.com/6mm-arc-review/

 

[David Milisock]

This should be a boon to the non reloader hunter. As long as $43 a box of 20 does not bother you. It should not, my 358 Norma Mag $64

 

[3Ackleys]

This should be a boon to the non reloader hunter. As long as $43 a box of 20 does not bother you. It should not, my 358 Norma Mag $64

Midsouth has 2 different 6ARC Hornady loaded ammo listed for $20 ea.

 

[Hohn]

EDIT: Looks like this is basically a 6mm Grendel in Saami/Hornady trim. Grendel mags and boltface.

 

[Hohn]

@rcw3 must be feeling validated that some else picked up what’s essentially his idea. When he thought “ this thing is begging to be a 6mm” about the 6.5G, he was absolutely right!

 

[Kracken McGraw]

Where does it fall against the 6BR?

 

[Pvt.Donut]

Seems closer to a 6 PPC than to the BR.

 

[Bill K]

Seems like Hornady and Nosler just keep coming out with real good products for us shooters to play with and enjoy. I don't mind it one bit, other than it tempts my wallet more than it should.

 

[newbieshooter]

http://www.6mmar.com/



past references:

http://bulletin.accurateshooter.com/2010/02/young-champion-relies-on-tack-driving-6mmar-upper/

http://bulletin.accurateshooter.com/2009/11/grendel-based-6mmar-cartridge-for-high-power/

http://bulletin.accurateshooter.com/2008/04/6mmar-varminter-field-test/

http://bulletin.accurateshooter.com/2008/03/6mmar-case-forming-video/

 

[Evan]

Wonder if it has a small flash hole or a large one. Also wondering how much pressure it'll take. I am very excited about this though, mostly for off-the-shelf dies and components that will be available at cheap prices.

 

[Rustytigwire]

So looks like 87 vmax may have some jump?
Good to see this released.

 

[newbieshooter]

Wonder if it has a small flash hole or a large one. Also wondering how much pressure it'll take. I am very excited about this though, mostly for off-the-shelf dies and components that will be available at cheap prices.

from an older bulletin article: http://bulletin.accurateshooter.com/2013/09/robert-whitley-reviews-hornady-made-6-5-grendel-brass/

 

[SG4247]

Unless I am reading the prints wrong, this 6ARC case is .030” shorter to the shoulder, than standard 6.5 Grendel SAAMI. So if this is correct, it is not a necked down 6.5 Grendel.

This makes no sense, since it would be alot of extra headspace if this brass is used in the “OLD STD” 6AR chamber.

This ammo would also load and probably fire in a AR chambered in a 6.5 Grendel.

 

[David Milisock]

Midsouth has 2 different 6ARC Hornady loaded ammo listed for $20 ea.

Cool thanks.

 

[Larry Koch]

before the ink dries 6mm arc will be necked up and neck down.

 

[Kracken McGraw]

Can we nickname it Noah’s Arc!

 

[Adam in WI]

Someone should be along shortly to bash this simply because Hornady is producing it...

Standby.


That someone will not be myself.

 

[Kracken McGraw]

It will be interesting to see how accurate you guys can make it shoot out of a bolt gun. I think it will create a new surge in the AR-15 platform, hot item for coyote hunters.