-
Having trouble using the site?
Contact support
New 6mm Advanced Rifle Cartridge
- Thread starter Gtscotty
- Start date
The 6.5 Grendel was designed around a 123 grain bullet to optimize its ballistics performance. Bill Alexander's intentions were also for it to appeal to the hunting market, hence the 123 grain bullet weight.
Last edited:
Thanks, that's a shame, the T40 gives another 150fps, but still it's better than nothing.
I don’t think it is. Ihad a Lee Wells 6fatrat and shoot against turbo 40s. Fire forming the brass is a pain in the ass for no more of a return than you get. My 243lbc done just as well. Let alone the Lee wells whidden dies are over priced and I didn’t care for them from the start. If Hornady or whoever is releasing this cartridge can get someone like Peterson or Norma to make brass for it I think it will go over well. The 95 sierras are hard to beat when using the 6mm grendel variants. If you wantbetter performance over a 6mm predator or 243lbc with 95 grainers just move to the ar10 platform and run a 6xc creed or 243win.
Thanks, I have a GAP10 6CM that I use for PRS but like the idea of running a lighter AR15. I've used my JP 6.5 Grendel in matches with some good results, but have always fancied the 6mm variant. Agreed fire forming to the 40T would be a pain but apparently you still get fairly decent results even when fire forming. It would be nice to see Lapua getting on board as well.
A gunsmith in Wyoming built me a 6br on an ar15 platform. He just used a 458 socom bolt on it I believe. It shot well with the bartlien barrel. He builds dashers too. A dasher chambered ar15 with a Norma brass reamer and Norma Dasher brass maybe the ticket For running 105 and 107 grain bullets. I believe I used an elander mag with the front opened. It shot well and cycled. I still have his contact info if your interested.
Is he the guy that used to build 6 BRX uppers? Do you have his name?
Last edited:
Honestly if component availability is your primary concern (rather than factory ammo), there's no disadvantage to the current 243 LBC and some of the other variants. It's just Grendel brass, there is no forming except the first pass in the reloading die necks it down from 6.5 to 6; you almost can't tell it's happening.
On the other hand, it'll be a while before you have anything but Hornady brass available for the 6 ARC, IMO. If you want to use Lapua, now you're pushing the shoulder back too (i.e. you should consider neck turning) vs just necking down.
I could be wrong, but I think the only reason Hornady shortened the shoulder on this cartridge .030" is to make it incompatible with the current wildcats. The cartridge doesn't need it for bullet base vs neck/shoulder junction reasons, and the reduced capacity only limits performance a little while not being enough difference to make it a lot more efficient. I understand why Hornady wouldn't want their ammo used in wildcat chambers for liability reasons, but guys shouldn't expect this to be a better performer than current options.
Looks like someone is running ahead of the marketing embargo?
San Tan Tactical Announces the Collaboration with Hornady Mfg and Proof Research on the New 6ARC (Advanced Rifle Cartridge) STT-15-6ARC Rifles | Soldier Systems Daily
CHANDLER, ARIZONA: San Tan Tactical®, Hornady Mfg® and Proof Research® have partnered up on the San Tan new 6ARC rifles. San Tan’s innovative high quality f ...
soldiersystems.net
So I wonder if proof is going to start cranking out barrels for it? If so I’ll probably go ahead and get on the 6month wait lol. Looks like the proof will be a 7.5 twist I wonder if that will stabilize the 108s in a 16 or 18” barrel?
I am going longer barrel ... maybe 22 or 24 in CF. Let's see what they offer. Open to recommendations on BCG and billet upper. All my stuff is Mega but they are no more ... and I'm not too interested in Zev.
8 twist will stabilize the 108s. You'll want 7.5 if you want to go any heavier.
The product intro is up:
www.hornady.com
First factory loads:
www.hornady.com
www.hornady.com
www.hornady.com
6mm ARC - Hornady Manufacturing, Inc
The 6mm ARC is an extremely versatile cartridge that does what much larger cartridges can, and everything that smaller cartridges can’t.
First factory loads:
6mm ARC 105 gr BTHP Hornady BLACK® - Hornady Manufacturing, Inc
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...
6mm ARC 108 gr ELD® Match - Hornady Manufacturing, Inc
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.
6mm ARC 103 gr ELD-X® Precision Hunter® - Hornady Manufacturing, Inc
Coming Soon! 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 mee...
Last edited:
It's not. I have a 22" 243 LBC. Even with a 9" suppressor hanging off the end, it's quite manageable.
I don’t think I wanna throw money into a proof cf until I have played with one for a bit, I’m still gun shy from Valkyrie (although I waited on the valk to age a little and that proved to be wise). I may go with a button barrel maybe someone like keystone, etc.
looks good though hopefully it catches on.
looks good though hopefully it catches on.
Eh, my Grendel is 16", but I'm much more interested in 18" to 20" for an ARC barrel, I think that length range will really be where it shines. I can't imagine that the ARC will sacrifice less than the Grendel when going short, but I suppose it does start out quite a bit faster with similar BC bullets.
It's a 6mm Grendel variant with the shoulder pushed back ~30 thou, uses a Grendel bolt and Grendel mags. The SAAMI case drawing is on the first post.
I think right now the Grendel will be impossible to beat in that config. I agree though i just told a buddy of mine i bet the 6mm ARC is going to be the go to SPR cartridge in an 18~20 inch config.
The PRI mags have ribs on the sides which seem to work the best. The ribs make the sides more ridged. I found with more than 5 22 BR or 6GT rounds in the other mags the sides will bulge. The PRI run flawless without any mods. As for the 22 or 6 mm in the grendel the ARC, Elander, or Alexander Arms mags are fine. If you are putting together your own upper, use the JP bolt. They last longer.
Ballistic Advantage barrels for sale now at Brownells.
https://www.brownells.com/search/in...m=Email&utm_campaign=5ed7b7ac488c3b30fc5a1181
https://www.brownells.com/search/in...m=Email&utm_campaign=5ed7b7ac488c3b30fc5a1181
While BA has a pretty good track record on affordable, and very decent AR Barrels, I'm going to hold out for a Proof CF 20 or 22".
I'll be looking to shoot the 103gr ELD-X more than likely.
Most everything anymore uses a type 2 bolt, but I’d check with your barrel mfg.
I only use the type 2 Jp bolts anymore when chambering / head spacing barrels
I only use the type 2 Jp bolts anymore when chambering / head spacing barrels
Well it’s official, the new product from Hornady is the arc. I got an ad from ballistic advantage today as well stating that they are doing a pre-order on arc barrels. Looks like there is a wide range of other companies supporting the ARC. Hornady listed APF Armory, Barrett, Brownells, Christensen, CMC Triggers, CMMG, GAP, Geissele, Howa, Lantac, Mossberg, NEMO, Noveske, Odin Works, Proof, Radical Firearms, Unitah, Wilson Combat as manufacturers of firearms chamber in the arc. I’ll be interested to see the howa and mossberg ARC bolt gun offerings.
Exactly, the bolt for a type 1 chamber is just a 7.62x39 bolt. The type 2 and SAAMI chambers all fit the actual Grendel bolt, which the ARC will as well.
The ARC shows up as an option on Proof's website, but all I see for SS and CF barrel lengths right now, unless I'm missing something, is 16" and 18".
Is 20-25 fps per inch a good ballpark velocity drop from the 24" test barrel?
The recommendations are to just purchase the JP Grendel bolt from folks who've had the pre-Hornady SAAMI spec 6mm grendel.
Hmmmm... It's not like those wouldn't work, but I really want to be up in the 20-22" suppressed for longer shots and keeping velocity up. It may not make that much difference, but still what I would prefer.
I'll wait a little bit to see what's happening anyhow. I haven't seen brass or dies showing in stock as of yet. I'm not really interested in factory ammo.
Id venture to guess at 11.5 or 12.5 the drop off is going to be drastically more for the 6mm heavies. They are getting 2750-2800 with a 24bbl. If it pushes 103gr Eld x at 2400~2500 in a short barrel config i will be ditching my grendel.
Similar threads
