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224V or 6mm ARC

aslrookie

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Minuteman
Mar 19, 2017
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I am making this decision based on an 18” barrel. Reasons: shorter OAL when suppressed, lighter in weight, most places within an hour drive only have 800 yards max range (3.5hr drive for 1200+yards) and can be used for deer/yote hunting.

I previously had a Valkyrie and was impressed with it. I consistently made hits at 750 on a mini ipsc even with the 75gr TMJ. This was with a 24” barrel though, so it makes me wonder if it would still be that easy after losing 6” of barrel length. Locally, the ammo has been available and reasonably priced.

The 6mm has much better BC bullets, but ammo is more scarce than 223 and 9mm with maybe 1 or 2 boxes I’ve ever seen locally. Online is showing $2.30/rd. Aside from the ammo availability, my other concern is the 6.5G bolt it uses. I’m not a fan of that thin metal at the rim of the bolt face. 5.56 bolts break, so it would be expected that a 6.5G bolt is likely to fail at a much earlier round count.

The 6mm is also untested. At least we all know the deal with the Valkyrie. I don’t reload, so primer pockets and load data doesn’t matter to me.

What say the hide?
 
I'd put money on 6mm ARC being around much longer than .224 Valkyrie. Right now and for the foreseeable future, .224 Valkyrie will be at most a precision/hunting cartridge, while 6mm ARC will be in much wider use among the same circles plus run-n-gun folks.
 
I'm in the process of putting a 6 arc together. I went down the 224 Valkyrie route before and just couldn't get it to shoot well. It just seems like the 6arc is just better suited for more things. I'll see how it goes once it's together.
 
The 6mm is also untested.
Says who? The good thing about the ARC is that it's built out of components that are all proven to work.

The 224 was hyped up based on a single bullet that ultimately didn't work out. The ARC on the other hand, no one is asking if a 6mm bullet can perform.

6mm is probably one of the most heavily tested bullets around. You have a lot of various bullets that have been tested more than almost anything else out there. It might not all be done on the 6ARC platform but it's still tested.

I passed up the 224 right out of the gate and I'm glad I did. I'm all in on the ARC which in my opinion is a far more superior cartridge in just about every possible metric.
 
Not really. The 6ARC is so close to being a 6mm Grendel it's a bit disingenuous to pretend like it's a "new" cartridge. 6mm Grendel variants have been around a long time.
It's like the saying that better ingredients gets better pizza. There is very little left to chance with the 6ARC.

They basically took designs from several places and adopted them into one thing to create something new.

Basically a lot of old proven things that until now had not been put together yet.

The 6ARC is a logical evolution. It's not at all some random hodge podge of new stuff.
 
The 224 with 80gr ELDs is a good combo, should hit 2800 out of an 18" using H4895.
The 6mm ARC is my 6mm Predator(243lbc,6mmAR) run in .020 shallower. It is apx 50fps slower than those wildcats that have been around since 2007. 95s are the sweet spot.
 
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I just got turned on to 6mm ARC. So far, I've read/heard that it is optimized for an 18" barrel.

How realistic is 6mm ARC as a "general purpose" cartridge using, say, a 14.5 (or even shorter) barrel?

I've been seeing some 7.62 NATO rifles being made with shorter and shorter barrels on the basis that that cartridge is not "velocity dependent" for its performance. Any outlooks on 6mm (say, vs. Mk262) out of a shorter barreled small frame AR?
 
Naaman,

For your short barrel question, I am getting 2395 fps out of my 12” Monster 6ARC barrel using factory ammo. I get 2340 fps with Black Hills MK 262 out of my 10.5 Noveske.
 
Naaman,

For your short barrel question, I am getting 2395 fps out of my 12” Monster 6ARC barrel using factory ammo. I get 2340 fps with Black Hills MK 262 out of my 10.5 Noveske.
Wow. That's pretty sweet. Seems like it's viable in every application.

Any data on barrel life? So far, I'm finding that 6mm burns up barrels faster than 6.5s, but all I've found is hearsay at this point.
 
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Can’t speak to barrel life. My 18” has 76 rounds through it and the 12” has even fewer.

I am a low volume shooter so probably won’t shoot my barrel out. But I’d be interested to hear from others with more 6mm knowledge.
 
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I just got turned on to 6mm ARC. So far, I've read/heard that it is optimized for an 18" barrel.

How realistic is 6mm ARC as a "general purpose" cartridge using, say, a 14.5 (or even shorter) barrel?

I've been seeing some 7.62 NATO rifles being made with shorter and shorter barrels on the basis that that cartridge is not "velocity dependent" for its performance. Any outlooks on 6mm (say, vs. Mk262) out of a shorter barreled small frame AR?

I did play with the numbers on a 18” 224V vs 18” 5.56 by comparing Mk262 ammo to 75gr TMJ ammo being that the BC and weight is practically the same. The Valkyrie only showed a 64fps gain over 5.56 based on what I saw online. That doesn’t really seem worth using a new type of ammo, bolt and magazines.

So now I’m pretty much eliminating the Valkyrie from the equation. My main concern with the 6mm is using that reamed out bolt. I’ve used a 6.5G years back. I took it out to 1,193 yards on full size silhouette steel with multiple hits. That was with a 22” barrel though. I think the 6.5G is just too slow.

I know the DOD wanted this, but they also wanted 300blk, 6.8spc and neither of those became mass produced enough drive down ammo cost. Will they invest a lot in a new caliber under a biden admin? Likely not. It’ll be special use for certain groups. It’s hard not to consider the cost when ammo seek shows $2.40/rd for a non-magnum caliber.
 
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6 ARC will be closer to 223 than 224 Valkyrie for barrel life. The 6mm barrel burners are burning 40-45gr of powder not 28-30.

I can't tell you what barrel life in an ARC will be, but I've got one that's north of 3k with no loss of velocity or accuracy. In general, when I bore scope ARCs, they look like a 6.5 Creedmoor with half as many rounds on them.
 
I know the DOD wanted this, but they also wanted 300blk, 6.8spc and neither of those became mass produced enough drive down ammo cost. Will they invest a lot in a new caliber under a biden admin? Likely not. It’ll be special use for certain groups. It’s hard not to consider the cost when ammo seek shows $2.40/rd for a non-magnum caliber.
I was just looking at that today and got my daily reality check! I'll either settle in with 262, or just wait a while before I bother with an SPRish upper build.
 
6 ARC will be closer to 223 than 224 Valkyrie for barrel life. The 6mm barrel burners are burning 40-45gr of powder not 28-30.

I can't tell you what barrel life in an ARC will be, but I've got one that's north of 3k with no loss of velocity or accuracy. In general, when I bore scope ARCs, they look like a 6.5 Creedmoor with half as many rounds on them.
Good info. Thanks. One of the reasons I consider barrel life is because I try to factor in the possibility that at some point, there will be no support for a given tool for an indefinite period. For now, it seems like 5.56 and .308 are the old standbys in that regard.
 
Good info. Thanks. One of the reasons I consider barrel life is because I try to factor in the possibility that at some point, there will be no support for a given tool for an indefinite period. For now, it seems like 5.56 and .308 are the old standbys in that regard.
So we should be buying CNC machines instead of gun parts? lol
 
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My local Scheels and Sportsman’s have stacks and stacks of .224 Valkyrie at pre-Wuhan flu prices. It’s the only rifle ammo I’ve seen for that low of a price, which seems to indicate they’re trying to give it away.

I’ve been shooting Grendel actively since 2009, with enough spent brass in boxes to show for an actual round count across multiple blasters. I guess I’m doing something wrong because I have yet to break a bolt. I’ve broken bolts in 5.56 that were run in tortuous sessions where the cam pin hole cracked after 10k rounds.

Don’t ever look at how thin the bolt walls are on a SCAR-17S/20 or the POF Revolution pushing 10psi more chamber pressure and bolt thrust. Keep in mind .308 Win is 62,000psi MAP with far more bolt thrust than the .441” case head/52,000psi Grendel/6mm ARC.

Revolution L, 5.56 AR-15 R
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Revolution L, POF large frame .308 R - both accommodate .473” case heads.
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I was in the same position three years ago....224V or 6.5 Grendel....then I found out about the 6MM AR/Grendel wildcat and took that direction. The two (6 ARC and 6MM AR/Grendel) are very close in performance. I have just a tad over 4,500 rounds with no problems. Shoots 87 GR Vmax, 95 SMK and 107 SMK.....given the choice today I would go with the 6 ARC.
 
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