Anybody here running a 6mm Creedmoor AR?

marksman13

marksman13

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Oct 3, 2006
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Location
Mississippi
I’ve been looking for a new rifle as a thermal host. I want something that is flatter shooting than my 308s or 6.5 CMs, but honestly, I just want an excuse to buy a new rifle. Primary use is going to be coyote and pig hunting at night, so weight is a concern and match accuracy really isn’t. I’ll probably end up using 90 grain bullets for the flattest possible trajectory out to 350 yards or so. Doubt I’ll be shooting much past that distance at night.

What I really want is a POF Prescott, but they seem to be unobtanium at the moment in 6mm CM. I have a POF Rogue in 308 and I’m fairly happy with it. Nothing on the market is lighter other than the new Roam rifles and they don’t really appeal to me, nor do they offer a 6mm CM.

Another option would be the Seekins SP10, but that gains me about three pounds of additional weight. Not the end of the world, but also, unable to source locally.

Anybody here running a 6mm CM on a large framed AR platform? If so, what are you running and how reliable has it been?
 
My 6 Creed gasser is a Proof Research barrel on Aero receivers, upper and lower, JP low profile detent gas block. I melt my lugs to avoid chewing up brass, and I tune my gas to cycle reliably without misbehaving. Not sure what reliability issues you’re expecting? I’d built hundreds of AR’s before this rifle, including 50-60 large frames in 308, 7-08, 260, 338, 243, 6.5, and 6 creed, so getting them to run doesn’t feel terribly heavy.
 
Varminterror said:
My 6 Creed gasser is a Proof Research barrel on Aero receivers, upper and lower, JP low profile detent gas block. I melt my lugs to avoid chewing up brass, and I tune my gas to cycle reliably without misbehaving. Not sure what reliability issues you’re expecting? I’d built hundreds of AR’s before this rifle, including 50-60 large frames in 308, 7-08, 260, 338, 243, 6.5, and 6 creed, so getting them to run doesn’t feel terribly heavy.
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I’ve seen a couple different claims about feeding issues with those long, skinny bullets and steep shoulders. I know I’ve personally seen more feed issues with 6mm ARC and 6.5 Grendel than I have with 6.8 SPC, 5.56 and 308. May not be a real issue, but I wondered if that might be part of the reason that so many big brands have been slower to adopt the 6mm CM to their gas guns compared to the 308 and 6.5 CM.
 
I’d tend to expect, personally, the 6 creed is just getting too far specialized for what most folks want in a gasser. I know several guys with 6 Creeds and GT’s, or 22 creeds built for calling coyotes and smacking hogs, but they’re all long range competition guys which are already otherwise 6 or 22 creed guys. But when a manufacturer is marketing gas guns, who is buying them? Guys who want cheap, broadly available ammo, and NOT guys who want a barrel smoked in 1500 rounds, and NOT guys who are really concerned with the differentiation between LR performance over a 6.5 creed. But then again, I haven’t had trouble getting Grendels or ARC’s to feed either, other than acknowledging the extractor bevel on MOST Grendel bolts are cut incorrectly, and don’t want to snap over freely without being dressed.

In saying “big brands” don’t offer 6 creed for whatever reason, I guess I’d counter with Seekins, GA Precision, and JP all offer 6 Creeds in their LFAR lines. 6 Creed simply isn’t as popular in market as 6.5 creed, and obviously not as popular as 308win. But not as many folks are wanting the cutting edge of low recoil precision at long range AND buying it in a gas gun as those which buy semiauto rifles with more affordable and prevalent ammo.
 
I built mine with PSA upper and lower with a Brownell's house brand barrel. It runs fine and shoots fantastic. The only issue has been it was overgassed when I put my Gemtech One on it, prolly could have just put an adjustable gas block on it but I opted to switch to an OSS suppressor.
 
The feeding issues are related to magazine followers as much as anything else. No matter which 6mm or 6.5mm cartridge, they feed fine with the proper profile magazine follower.

I read the same thing about 6ARC having feeding issues when I built my last rifle. After digging deeper, most problems were magazine related. I have been using ACS 6ARC mags that have a follower actually designed for 6 ARC and have not had any issues with them.
 
Varminterror said:
I’d tend to expect, personally, the 6 creed is just getting too far specialized for what most folks want in a gasser. I know several guys with 6 Creeds and GT’s, or 22 creeds built for calling coyotes and smacking hogs, but they’re all long range competition guys which are already otherwise 6 or 22 creed guys. But when a manufacturer is marketing gas guns, who is buying them? Guys who want cheap, broadly available ammo, and NOT guys who want a barrel smoked in 1500 rounds, and NOT guys who are really concerned with the differentiation between LR performance over a 6.5 creed. But then again, I haven’t had trouble getting Grendels or ARC’s to feed either, other than acknowledging the extractor bevel on MOST Grendel bolts are cut incorrectly, and don’t want to snap over freely without being dressed.

In saying “big brands” don’t offer 6 creed for whatever reason, I guess I’d counter with Seekins, GA Precision, and JP all offer 6 Creeds in their LFAR lines. 6 Creed simply isn’t as popular in market as 6.5 creed, and obviously not as popular as 308win. But not as many folks are wanting the cutting edge of low recoil precision at long range AND buying it in a gas gun as those which buy semiauto rifles with more affordable and prevalent ammo.
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I can see where demand for 6 CM would be significantly lower than 308, but I didn’t realize it was so far behind the 6.5 CM in popularity.

By big brands, I was referring to the more mainstream manufacturers. GAP, Seekins and JP are more boutique builders centered around high end, expensive rifles. I’m originally budgeted $2500 for this rifle which isn’t really cheap and all three of this brands are above that price with GAP and JP being significantly more expensive. I’m not saying they aren’t worth it, and I’m not saying I wouldn’t spend that kind of money if accuracy was my primary concern, but that’s just not what I had in mind this time around.
 
@marksman13 - my point was rather that some of the most reliable LFAR’s on the market are offered in 6 creed, and if there was a feeding and reliability issue, these experts in the design would quote Wild Bill Shakespeare to their highly scrutinizing customers, “that way, madness lies. Let me shun that, no more of that.”

And of course, also clarifying, I wasn’t suggesting that you need buy one of these brands, but rather simply supporting evidence that reported feeding issues tend to be derived not from the experts in the field but rather folks which either haven’t ever touched the rifles and are simply speculating, or by folks which slapped together random parts without understanding how the rifles run. Knowing how to assemble parts isn’t the same as knowing how to tune AR’s, and unfortunately, there are a lot more guys doing the former than the latter.
 
We see it all the time here and on other forums where someone builds an AR with what ever parts they can get all from different manufacturers and then wonder why the rifle won't run. Doing your homework and ensuring all the parts work together makes assembling your own rifle much more pleasurable.

And when it comes to large frame AR rifles, you really are better off sticking with one manufacturer for both upper and lower receivers and also using parts from the same company.
 
marksman13 said:
I’ve been looking for a new rifle as a thermal host. I want something that is flatter shooting than my 308s or 6.5 CMs, but honestly, I just want an excuse to buy a new rifle. Primary use is going to be coyote and pig hunting at night, so weight is a concern and match accuracy really isn’t. I’ll probably end up using 90 grain bullets for the flattest possible trajectory out to 350 yards or so. Doubt I’ll be shooting much past that distance at night.
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Based on your intended use, is there any advantage the 6 Creed has over a .243? Plenty of excellent hunting bullets in the 90 - 100 gr weight class can be loaded to .243 mag length.
 
Laphroaig said:
Sounds like advantages that would mean more to a competition shooter than a night time pig hunter who knows match accuracy isn't a necessity.
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Sounds like an irrational bias.

I built my first 243AI NOT for competition, just as a deer rifle - and if a 6 creed were available at the time, I would have built that instead. I built my first 6 Dasher over 15yrs ago, also NOT for competition, and didn't start competing with one until 4yrs ago.

I absolutely fail to understand your bias that less powder use and easier load development should only be specific to competitors. It makes MORE sense, rather, that a more casual application where diligent dedication to load development isn't pertinent, such a "pig hunter" can more quickly and easily find a no-nonsense load which does what they need, and then have their barrel deliver longer reliable life sure seems to be sensible.
 
Laphroaig said:
Like you said:
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You're taking his comment out of context, but in the context you're suggesting so would be the 243 hence you don't see many gassers in 243 either comparatively.
Although I tend to agree with the sentiment if you're never gonna load 100+ VLD type bullets the 243 might be ok.
But in that sense for a 350 yard coyote gun you could prolly just run an ARC and have a pound lighter gun.
 
That looks like a nice gun but man there's a big disconnect in cost between factory big frame ARs and what a guy can build a nice one for.
 
mavracer said:
That looks like a nice gun but man there's a big disconnect in cost between factory big frame ARs and what a guy can build a nice one for.
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Honestly, I started putting parts together the other day and I was over $2200 on the bare rifles with the parts I wanted to keep the build under 10lbs. This rifle saves me a bunch of weight for about $300 more, plus I’ve got a factory warranty and no extra work on my end.
 
marksman13 said:
Honestly, I started putting parts together the other day and I was over $2200 on the bare rifles with the parts I wanted to keep the build under 10lbs. This rifle saves me a bunch of weight for about $300 more, plus I’ve got a factory warranty and no extra work on my end.
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Ouch I just went and looked at my spread sheets on my builds and if I subtract glass and suppressor both my 308 and 6 creed together are less than 2200.
 
marksman13 said:
I could have gone cheaper, weight was a concern. The barrel I wanted was going to be nearly $800.
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I might step up to one of the proof barrels when this one is toast. I think if I did I would want to swap my PRS for a PRS lite to balance things out.
I'm very much in the camp of focusing the money on the barrel, trigger and glass.
 
mavracer said:
I might step up to one of the proof barrels when this one is toast. I think if I did I would want to swap my PRS for a PRS lite to balance things out.
I'm very much in the camp of focusing the money on the barrel, trigger and glass.
Click to expand...
I looked hard at Proof, but I was going to buy a BSF. They make good stuff and they are the supplier of Springfield’s barrels on their 2020 Waypoint rifles.
 
marksman13 said:
I looked hard at Proof, but I was going to buy a BSF. They make good stuff and they are the supplier of Springfield’s barrels on their 2020 Waypoint rifles.
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Well crud went and looked and remembered why I can't do either they're .875 at the muzzle and my OSS is a gen 5 reflex style that shrouds about 4" and ID is for a .750 barrel.
 
Yeah, balancing a Magpul PRS Gen 1-3 is a bear, and damned sure not getting there with a carbon fiber barrel for a proper forward balance on a hunting/field/PRS rifle. I need to swap my XLR stock onto my AR-15 match rifle and move my PRS onto my AR-10, the extra weight having 3lbs of Mlok weights on the handguard of my 10 in 6 creed makes a lot more sense than on my 15 in 243LBC.
 
Varminterror said:
Yeah, balancing a Magpul PRS Gen 1-3 is a bear, and damned sure not getting there with a carbon fiber barrel for a proper forward balance on a hunting/field/PRS rifle. I need to swap my XLR stock onto my AR-15 match rifle and move my PRS onto my AR-10, the extra weight having 3lbs of Mlok weights on the handguard of my 10 in 6 creed makes a lot more sense than on my 15 in 243LBC.
Click to expand...
My gen 5 OSS does a wonderful job lol at 26oz it's an extremely heavy suppressor by current standards.
 
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