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Old January 26, 2018, 19:28   #1
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American Rifle Co. Nucleus - their new bolt action

The Nucleus ($850 intro/$1k MSRP) appears to borrow heavily from their Mausingfield ($1600).

- Rem 700 footprint/trigger compatible
- Controlled feed, Mauser-esque extractor
- Springfield '03 style inertial ejection
- Solid bolt stop
- Toroidal, interchangeable 3-lug bolt head with 72 degree throw
- Anti-bind rails, dual cocking cams
- Savage small-shank barrel compatibility
- .062 firing pin tip can be used with all primers (damn you AI)
- .223, .224Valkyrie, .308, .300WM bolt heads to be offered. No .338LM size

ARC intro video, long and not edited and presented by the owner/chief engineer, but covers the all key design points and assembly:
https://www.youtube.com/watch?v=wro5WuprNwE

ARC is also offering the BarLoc for $50 with intro purchase of the Nucleus. To my understanding it works like this (pardon the layman explanation):
- The BarLoc allows barrel changes w/use of proper chamber gage, similar to Savage but -
- differs in that the barrel is hand-tightened to the gage and then the BarLoc collar's cross bolt is tightened to provide the same tension as a sub-100 ftlb barrel torque
- The tension is provided by two opposing conical interfaces on either side of the collar; the conical interfaces force-pull the barrel threads against the action threads

Yeah, I'm nerding out on this one. Looks like my all-around dream action.
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Old January 27, 2018, 09:32   #2
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Might want to try a search or maybe just ask about them over at benchrest central before committing a deposit and high hopes...
I remember reading some less then steller reviews...
On their original action that is,,,not this yet to be produced cheaper one..
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Old January 27, 2018, 11:35   #3
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yovinny, any keywords or incidents I can search for at BRC? I would appreciate it. The stuff I've read there so far giving is me a Fudd headache. The ARC deal ends tomorrow.

I've shot 3 different versions of the Mausingfield, a very early one and then two later models with differing cocking weight/action configs.

He's had no trouble with them in the last 3? years he's owned them, last 2 were built by LRI. I'll probably go with LRI for the first barrel as well, given their experience with ARC. LRI indicated pre-fit barrels would be a no brainer if he's had the receiver in the shop before.
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Old January 27, 2018, 13:21   #4
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Quote:
Originally Posted by Fn/form View Post
yovinny, any keywords or incidents I can search for at BRC? I would appreciate it. The stuff I've read there so far giving is me a Fudd headache. The ARC deal ends tomorrow.

I've shot 3 different versions of the Mausingfield, a very early one and then two later models with differing cocking weight/action configs.

He's had no trouble with them in the last 3? years he's owned them, last 2 were built by LRI. I'll probably go with LRI for the first barrel as well, given their experience with ARC. LRI indicated pre-fit barrels would be a no brainer if he's had the receiver in the shop before.
Dont remember offhand,,,maybe search American rifle co....or what custom action to choose ??

Iirc, A few accuracy smiths chimed in and there was some mention of not all 3 lugs contacting, loose tolerance and other type stuff you would NOT expect to see in a custom action,,,or even a trued production one...

Sorry I cant be more help...
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Old January 27, 2018, 13:31   #5
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Dont remember offhand,,,maybe search American rifle co....or what custom action to choose ??

Iirc, A few accuracy smiths chimed in and there was some mention of not all 3 lugs contacting, loose tolerance and other type stuff you would NOT expect to see in a custom action,,,or even a trued production one...

Sorry I cant be more help...
Yeah, I tried ARC, Mausingfield... will keep looking, thanks.
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Old January 27, 2018, 17:27   #6
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For anyone interested it looks like this is the thread on BRC:
http://benchrest.com/showthread.php?...build-on/page5

Not finding any other mentions.
https://www.google.com/search?q=site...m+mausingfield
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Old January 27, 2018, 20:11   #7
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Just found the one thread ?
I thought it was mentioned in a couple of different threads, but its not something id be interested in anyway, so didnt pay a lot of attention...
What did you decide ?
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Old January 27, 2018, 20:58   #8
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It's the only BRC thread that Google has indexed for Mausingfield. Doesn't mean it's the only one but it's all I can find.

I'm in for one long action + some goodies. We'll see what happens.
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Old January 28, 2018, 08:24   #9
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Best of luck with it...
Keep us advised with info on your build..
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Old January 28, 2018, 12:13   #10
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Roger, wilco.

Griffin & Howe had a special build at SHOT, I believe it was based on the forthcoming ARC "hunter" action.

Patriot Valley is offering their Nucleus-based, Bravo-stocked John Hancock model as a PRS-legal "production" rifle (sub-$2k rule IIRC).

Short Action Customs demo'd the bolt lift effort at SHOT:
https://youtu.be/0mISKYt5_oA?t=10s
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Old January 29, 2018, 10:37   #11
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That action looks nice, but Ive a question for ya...
How do you bed them,,or any savage type action for that matter.?

Showing my ignorance, but Im a remmy guy, though Ive also got winnys, mausers, sakos, howas, 03s and some other rebuilt bolt guns.
Bedding SOP for me has always been action and first 3" of barrel into devcon or acragel, the rest floated. Heavy barrels well floated (like.06"), lighter ones much less and sometimes require contact pads up front.
Some of the hunting rifles are just pillar bedded, but anything looking for real accuracy is fully bedded...
Bench guns are glued in...not completely like some of the real BR guns of today that dont even have action screws, but their not broke loose from the bedding afterwards and easily removable from the stock like a hunting rifle would be.

How are these savage type actions with a barrel clamp or nut directly in front of the action usually bedded ??
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Old January 29, 2018, 17:47   #12
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Interesting question. I've never owned a switch barrel setup, Savage or otherwise.

I will be using a chassis.

As an aside, I just read that ARC has extended the sale to Jan 31.
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Old February 15, 2018, 17:16   #13
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I'm not sold on the toroidal geometry being an improvement.
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Old February 15, 2018, 18:32   #14
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It doesn't look like a very good action at all to me. I think you would be significantly better off with a trued Rem action with a PT&G bolt

There's also Stiller and Defiance to consider. Regardless of which one you get, it's a good idea to have them trued. It's not unusual for them to be out more than a Rem 700 action and you're stuck with the bolt

Personal, I would prefer a trued 700 with a reamed raceway to .703 and a .701 PT&G bolt

For a PRS rifle, I'd go with a Deviant Tactical. The integral rail will increase rigidity and the integral recoil coil lug would be nice

Sorry to be a stick in the mud. The switch barrel thing doesn't add anything and, if it did, it wouldn't make up for the negatives
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Old February 15, 2018, 18:36   #15
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I agree, I'm partial to mauser actions, I don't see this action being better than what's already done. The curvature of the lugs will make a point contact, I'll take lapped any day. More contact, no hot spots.

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Originally Posted by CG&L View Post
It doesn't look like a very good action at all to me. I think you would be significantly better off with a trued Rem action with a PT&G bolt

There's also Stiller and Defiance to consider. Regardless of which one you get, it's a good idea to have them trued. It's not unusual for them to be out more than a Rem 700 action and your stuck with the bolt

Personal, I would prefer a trued 700 with a reamed raceway to .703 and a .701 PT&G bolt

For a PRS rifle, I'd go with a Deviant Tactical. The integral rail will increase rigidity and the integral recoil coil lug would be nice

Sorry to be a stick in the mud. The switch barrel thing doesn't add anything and, if it did, it wouldn't make up for the negatives
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Old February 15, 2018, 19:43   #16
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Toroidal lugs are already proven accurate for the last few years in the Mausingfield.

The doubt on rails, lugs and recommendation for binding bolt alternative actions is silly.

I don't know of any other action that combines as much of what I want in one package without compromise. If I could add anything it would be AW mags.

I'm stoked on having 1 trigger, 1 chassis, 1 scope for three different clamberings. Might go with a scope with toolless zero.
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Old February 15, 2018, 19:56   #17
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Mauser action is proven accurate for the last century, Remington for decades. Toroidal isn't proven better, I don't see the point.

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Originally Posted by Fn/form View Post
Toroidal lugs are already proven accurate for the last few years in the Mausingfield.

The doubt on rails, lugs and recommendation for binding bolt alternative actions is silly.

I don't know of any other action that combines as much of what I want in one package without compromise. If I could add anything it would be AW mags.

I'm stoked on having 1 trigger, 1 chassis, 1 scope for three different clamberings. Might go with a scope with toolless zero.
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Old February 15, 2018, 22:36   #18
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You speak as if toroidal is not as good. Facts prove otherwise.

Remingtons are so awesome that people make a living on improving them. Imported Finn sporters run circles around anything Rem makes in that class.

The few current, mass produced, decent representatives of the Mauser design do NOT have great aftermarket support. Heck, even the Finn sporter has more aftermarket options than all of them combined.
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Old February 15, 2018, 23:46   #19
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The only problem with a Remington is the lack of machining quality. They ARE easy to chuck in the lathe though. Most if the ones I've trued had .025" run out. The toughest one I ever trued was my Weatherby Mark V.
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Old February 16, 2018, 01:31   #20
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The only problem with a Remington is the lack of machining quality. They ARE easy to chuck in the lathe though. Most if the ones I've trued had .025" run out. The toughest one I ever trued was my Weatherby Mark V.
As if poor machining wasn't enough, add bolt handles twisting off, sub-par extract/eject system and the fact almost all of them are built to a price point in the first place. Their big wigs have let themselves become the Bushmaster of bolt guns.

Their only claim to fame now is how many improved actions claim to share the same footprint for stock/trigger compatibility.

I have NOTHING against someone who wants to tinker with them or has a lot of legacy time invested in the quirks and a stable full of solid rifles. Or who wants a low budget build.

On the other hand, there are way better choices to start with these days.
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Old February 16, 2018, 01:43   #21
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On the other hand, there are way better choices to start with these days.
I agree.
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Old February 16, 2018, 05:26   #22
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You're a bit too emotionally involved to discuss facts.



Quote:
Originally Posted by Fn/form View Post
You speak as if toroidal is not as good. Facts prove otherwise.

Remingtons are so awesome that people make a living on improving them. Imported Finn sporters run circles around anything Rem makes in that class.

The few current, mass produced, decent representatives of the Mauser design do NOT have great aftermarket support. Heck, even the Finn sporter has more aftermarket options than all of them combined.
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Old February 16, 2018, 09:59   #23
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RSS is a bullshitter and WESOMATIC is right, Fn/form is too emotionally involved.
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Old February 16, 2018, 17:10   #24
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You're a bit too emotionally involved to discuss facts.
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RSS is a bullshitter and WESOMATIC is right, Fn/form is too emotionally involved.
Hahaha, so say the guys that don't discuss facts.

The King and the Duke--only the King has no clothes and toroids give hemorrhoids to the Duke.
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Old February 16, 2018, 17:13   #25
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Do you want someone to say it's okay to buy one?
It's okay for you to buy one.
Do you feel reassured now?
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Old February 16, 2018, 17:20   #26
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WESOMATIC is my slave name. From now on I am The Duke.


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RSS is a bullshitter and WESOMATIC is right, Fn/form is too emotionally involved.
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Old February 16, 2018, 19:13   #27
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WESOMATIC is my slave name. From now on I am The Duke.
LOL that was awesome.

Yes, m'lord.
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Old February 16, 2018, 19:16   #28
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Do you want someone to say it's okay to buy one?
It's okay for you to buy one.
Do you feel reassured now?
It is with great enjoyment that I recognize your embracing the full, double entendre of Huck FINN.
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Old February 16, 2018, 19:26   #29
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It is with great enjoyment that I recognize your embracing the full, double entendre of Huck FINN.
I've never read Huck Finn.
I'm just offering you the same emotional support that I offer anyone who's menstruating.
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Old February 16, 2018, 20:04   #30
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I've never read Huck Finn.
I'm just offering you the same emotional support that I offer anyone who's menstruating.
Too bad. The King and the Duke feature prominently.

As for menstruation, I don't know much about it, but I actually stopped my mom from menstruating once. True story.
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Old February 16, 2018, 21:40   #31
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I have my own shop and can build a rifle on any action. I used to build and still at times, custom 1911s

I've been blessed later in life and building custom guns isn't near as traumatic as for most people.

For a rifle
Careful chambering and the last 4" of barrel is crucial for accuracy. The chambering and threading I can control but nothing can be done about a bad bore. It is what it is.

It's good if a receive can be trued before barrel work but chambering and the last 4" of the barrel is crucial

The next thing is bedding of the action

Certainly, the trigger and scope must be of good quality and fit the purpose of the rifle

There are several good actions available, choose what you want
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Old February 16, 2018, 21:49   #32
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Fn/form
Quite seriously, if you have a question about anything you can PM me. I honestly don't known anything about Kings or Dukes but rifle accuracy is something that's important to me

You can't go wrong with the Nucleus if the chambering is done right and the barrel doesn't have any major problems
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Old February 16, 2018, 21:52   #33
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Fn/form
Quite seriously, if you have a question about anything you can PM me. I honestly don't known anything about Kings or Dukes but rifle accuracy is something that's important to me

You can't go wrong with the Nucleus if the chambering is done right and the barrel doesn't have any major problems
Fn/form, it would great if you had CG&L build one and post a range report.
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Old February 16, 2018, 22:17   #34
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Thanks for the offer CG&L.

Planning on LRI doing the first barrel(s), it will be later this year before I get to it sorted out.

Will definitely report back.
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