6mm arc bolt gun?

[David Milisock]

like?

my point on it is that its very similar to a 6br (which is what i'd prefer) design...but with good factory ammo, that's reasonably priced, since hornday is coming online. i don't think there will be anything CLOSE to the accessibility of this round, for someone wanting to dip their feet into the short/stubby round category

I agree, if things work out there should be an abundance of materials available at reasonable costs. It should be soft shooting and just not a bad Idea for a youth rifle or even a rifle for an adult. Use it where it fits and in the field it will fit plenty of uses.

I'm not selling my 6MM Remington but I'm buying an auto loader.

 

[F224]

like?

my point on it is that its very similar to a 6br (which is what i'd prefer) design...but with good factory ammo, that's reasonably priced, since hornday is coming online. i don't think there will be anything CLOSE to the accessibility of this round, for someone wanting to dip their feet into the short/stubby round category

The advantages of the 6XC and 6mmBR Norma are hard to ignore. The 6XC was designed to save barrel's compared to the superior 243Win, an important consideration to NRA High Power shooters. The 6mmBR, like the 6XC is inherently accurate and was designed to be a superior 300 meter cartridge.

For a purely NRA High Power competition rifle based the the AR15, the ARC makes a lot of sense, but in a bolt gun, I'm not seeing any advantages over other rounds currently available.

 

[GSRswapandslow]

The advantages of the 6XC and 6mmBR Norma are hard to ignore. The 6XC was designed to save barrel's compared to the superior 243Win, an important consideration to NRA High Power shooters. The 6mmBR, like the 6XC is inherently accurate and was designed to be a superior 300 meter cartridge.

For a purely NRA High Power competition rifle based the the AR15, the ARC makes a lot of sense, but in a bolt gun, I'm not seeing any advantages over other rounds currently available.

the advantage is cheap factory ammo....... that's why the creedmoor is so popular... the arc will follow suit. and i'll have one built on a 527 and an ar this year

 

[Gtscotty]

Can you tell us what other manufacturers are on the list of the arc launch.

From Hornady's website:

Gun makers who are producing the 6mm ARC

• Adams Arms
• APF Armory
• Barrett
• Brownells
• Christensen
• CMC Triggers
• CMMG
• GAP
• Geissele
• Howa
• Lantac
• Mile High Shooting Accessories
• Mossberg
• NEMO
• Noveske
• Odin Works
• Proof
• Radical Firearms
• SanTan Tactical
• Seekins Precision
• Uintah Precision
• Wilson Combat

Precision Firearms also recently posted that they are taking orders for AR barrels.

Midsouth also has a good page on the ARC with some info as well.

https://www.midsouthshooterssupply.com/articles/hornady_6arc.aspx

 

[Kracken McGraw]

 

[SD guy]

I would wait a few months and I am sure you can have your pick of CZ, Ruger and Howa as factory options since they chamber the Grendel already.

CZ is usually 5 to 6 years out before they move forward with a good decision to chamber a news round that is very compatible with the CZ527 action. 6.5 Grendel took a long while any way.

I pulled the trigger a few weeks ago on a drop in Pacnor 6mm 5 groove 7.5 twist chambered in 6mm ARC.

Looking to give 220 Russian brass a go in this round in part due to lack of availability of Hornady brass. Near as I can tell only down side of the 220 Russian may be the necks may a thou or two thinner. I am guessing the flash hole is a bit smaller as well. Suppose Hornady offers a small .057 diameter cap pin for their dies?

Should anyone here have any factory Hornady 6mm ARS brass Id appreciate a few measurments. Curious as to what they're actual neck wall thickness comes in at, along with the flash hole size. Suppose if you Have The Hornady sizing dies Would like to confirm the decapping pin diameter as well.

 

[Ron Mitchell]

I ordered a Uintah Precision upper and one of their matching billet lowers on the 10th of this month, they said that it would be a five week wait so they could build it and get it shipped out.

I called them yesterday to modify my order. They Durakote their barrels and I wanted to omit the coating. I am going to send it out to be Nitrided after it is broke in. Their barrel is a match grade stainless unit made by Preferred Barrel blanks, they are a subsidiary of MGM (Match Grade Machine ). They informed me that my upper was already built and ready to ship out today. So the five week wait ended up being about two weeks.

So those folks looking to get a true bolt action rifle these folks are the only game in town right now unless you want to wait months to get a barrel spun up for your rifle. Uintah has 24 left in stock the last time I checked and the upper will fit on your AR lower, and they include a Velocity trigger with the order.

https://uintahprecision.com/product/upr15/

 

[457ciSBC]

CZ is usually 5 to 6 years out before they move forward with a good decision to chamber a news round that is very compatible with the CZ527 action. 6.5 Grendel took a long while any way.

I pulled the trigger a few weeks ago on a drop in Pacnor 6mm 5 groove 7.5 twist chambered in 6mm ARC.

Looking to give 220 Russian brass a go in this round in part due to lack of availability of Hornady brass. Near as I can tell only down side of the 220 Russian may be the necks may a thou or two thinner. I am guessing the flash hole is a bit smaller as well. Suppose Hornady offers a small .057 diameter cap pin for their dies?

Should anyone here have any factory Hornady 6mm ARS brass Id appreciate a few measurments. Curious as to what they're actual neck wall thickness comes in at, along with the flash hole size. Suppose if you Have The Hornady sizing dies Would like to confirm the decapping pin diameter as well.

Hornady FL die ARC pin = .07135. You will have to install a smaller PPC pin.
Some observations from the first 50 cases that I loaded using the ARC FL die, rounds measured between .2688 -. 2718.

 

[SD guy]

My only reason to stick with the Grendel would be the lapua small flash hole brass. I don’t see the Hornady brass staying together for many reloads.

I will be giving Lapua 220 Russian try for the 6MM ARC when the barrel comes in for the CZ527

 

[Laurie]

I will be giving Lapua 220 Russian try for the 6MM ARC when the barrel comes in for the CZ527

Why not simply run 6.5 Grendel brass through a 6-ARC die, or am I missing something? I'm sure I've already read of that being done.

 

[Raptor]

All my 6 ARC brass was formed from 6.5 Grendel brass. You will need to trim about .050 or so off of it when your done sizing it down......

 

[JSH]

I really question a few of the comments on the Hornady video.

 

[JSH]

All my 6 ARC brass was formed from 6.5 Grendel brass. You will need to trim about .050 or so off of it when your done sizing it down......

How was neck thickness? A skim cut couldn’t hurt anything I imagine.

 

[457ciSBC]

Why not simply run 6.5 Grendel brass through a 6-ARC die, or am I missing something? I'm sure I've already read of that being done.

That would be my preferred way because you have enough excess length material to trim the case neck just shy of the chamber bevel. Forming from 220R, the fire formed case will be inherently short.

 

[Lefty Trigger]

Don't sell the Hornady brass short. It does indeed have a very lengthy life span, not inline with Lapua but still pretty decent. I would like to build a bolt gun in the 6mmARC but I'm a Savage guy and mag feeding issues is always a problem with the Savage actions and short fat rounds. My custom 6.5 Grendel is an awesome shooter but I built it on a single shot action.

 

[jeffreybehr]

Received my Uintah UP-15...

UP-15 Complete rifle – Bolt Action AR Uppers | AR-10 & AR-15 | Uintah Precision

***DUE TO ORDER VOLUMES, UP15 BACKORDERS HAVE ABOUT A 2-4 WEEK LEAD TIME*** ***In stock quantities represent components on hand to complete rifles. At this point, due to order volume, orders are being assembled as they are received.*** The UP-15 is a TRUE bolt action AR rifle with a 3-lug...

uintahprecision.com

...yesterday the 24th, and got it out for a little site-in and beginnings of barrel-break-in. Everything worked perfectly, the trigger is excellent, the rifle feels lighter than what I expected, etc.

I'm soon off to the shooting range at Usery (north Mesa, AZ) to finish the BBI, shoot a few groups, and take a few pics...

 

[Raptor]

How was neck thickness? A skim cut couldn’t hurt anything I imagine.

I had no issues with the neck thickness. My Lapua was right at .014 to .015 and the Starline was at .014. I always "Skim" turn all my brass to clean up the necks on anything I want to shoot longer distances with. I actually just returned from doing some 300yd load testing with my AR that I put an 18" Shaw barrel on. I tested 5 or 6 different groups and they were all in the .5 to .9 MOA range. I had two groups that put 4 rounds each into a .8 and .9 at 300yds. The 5th shot opened the groups to 1.8 and 2.2"s but I was still pretty damn pleased with that. Another group of 87VMAXs went into a 1.6" group @ 300yds.....

 

[SD guy]

That would be my preferred way because you have enough excess length material to trim the case neck just shy of the chamber bevel. Forming from 220R, the fire formed case will be inherently short.

Are we suggesting the 220R will need to be trimmed to fit the chamber bevel, Yet once fire-formed The 220R brass may yeild a cartridg a bit short on the OAL?

 

[457ciSBC]

Short where? Do you mean OAL? Are we saying the Lapua 220 Russian brass will not need to be trimer prior to fire-forming?

I measured some older gold box 220R brass, it’s around 1.515-1.517 in length. So, if one was to trim it blindly to let’s say the recommended 6ARC trim length, you have removed over .040 of material. If you take that 1.475 case and fireform it and it shrinks more, you could wind up with a FF case length that is far shorter than the SAAMI chamber length of 1.500.

I would keep trimming prior to fireforming minimal.

 

[SD guy]

Likely be 3 month or so b4 I have the barrel to work with. Ill take this in to consideration when trimming. Thank you for encouraging a guy to trim minimally.