New Build: Custom Radian 22" Bartlein 6 ARC

[Bigjake83]

Just took this girl out for her initial range session today to dial in the gas system.
All five round groups shot with Hornady Factory 105 black ammo.

Raidin Build Kit.

Geissele SSA-E X Trigger.

Vlotor A5 H2 Buffer system with Dark Hour 13 position receiver extension.

Paul Ross 22" Bartlein Barrel 4 Groove / .800 Gas Block Journal +2 gas system / 5/8x24 threads.

Young Manufacturing Chromed 6ARC HMB Bolt, in Radian Enhance Carrier.

 

[jetjock07]

You go with long or medium on that B5 stock??

 

[Bigjake83]

You go with long or medium on that B5 stock??

Long

 

[Bigjake83]

What's the general consensuson on best powders for 105's and 108's ?

 

[st1650]

What's the general consensuson on best powders for 105's and 108's ?

For speed ? CFE223, LVR and N540
For accuracy? Generally varget but it’ll cost you a good 100-150FPS

 

[Bigjake83]

For speed ? CFE223, LVR and N540
For accuracy? Generally varget but it’ll cost you a good 100-150FPS

Anyone tried TAC?

 

[st1650]

Anyone tried TAC?

I haven’t tried TAC but it could work, Staball match too. They’re a bit on the faster side so probably be a better match with a shorter/lighter bullet or a mono.

 

[Bigjake83]

In this thread

I haven’t tried TAC but it could work, Staball match too. They’re a bit on the faster side so probably be a better match with a shorter/lighter bullet or a mono.

With the Factory Hornady Black 105's I average 2656 FPS and a SD of 14 out of the 22" 4 Groove Bartlein, I only shot one box today so im sure it's a safe bet to say she might speed up. Next outing I'll throw a can on as well.

Oh! And in this thread Opinions are like Titties, I want to see them all. Feel free to share your thoughts on the build or any requests.

 

[232593]

@BurtG another data point for your 22 ARC vs 6 ARC inquiry.

@Bigjake83 what kind of velocity numbers were you getting on those 105s?

 

[Bigjake83]

@BurtG another data point for your 22 ARC vs 6 ARC inquiry.

@Bigjake83 what kind of velocity numbers were you getting on those 105s?

See above post

 

[thedude824]

Beautiful build! Is this your first time with the B5 precision stock? What are your thoughts?

 

[jetjock07]

@thedude824, I can’t speak for the OP but I just purchased a B5 in the medium config but I’m sending it back. The cheek riser is to short length wise. Other than that, the stock felt well built and pretty snug on buffer tube. There isn’t much up elevation in the cheek riser though. I’m thinking about getting a long version.

 

[Jsp556]

Looks great and printing some good groups. There’s really nothing to critique. Tits….

 

[padom]

AR Comp is scary accurate in my 6 ARC with low single digit SD's compared to CFE223 and Lever and extremely temp stable..

 

[Bigjake83]

@thedude824, I can’t speak for the OP but I just purchased a B5 in the medium config but I’m sending it back. The cheek riser is to short length wise. Other than that, the stock felt well built and pretty snug on buffer tube. There isn’t much up elevation in the cheek riser though. I’m thinking about getting a long version.

That's why you by the long version

 

[Bigjake83]

Beautiful build! Is this your first time with the B5 precision stock? What are your thoughts?

I think I have four of them now, I really enjoy them just wish that they had some built in Comb. I bought a couple M-LOK Bag Ridders that will give them some Comb that I'll test drive soon.

 

[jetjock07]

That's why you by the long version

Yeah, when I asked earlier in post I already had the medium in route to me.

 

[DocRDS]

And just to think I was thinking what kind of semi-auto in 6 should I build....very interesting!

(Built me a 6GT Bolt and ho-lee-fuck is that thing a dream to shoot--but deep down, I'm a semi-auto guy).

 

[WestTN2288]

Anyone tried TAC?

I use it a lot. 27.5 gr of TAC gets me to about the same FPS as 29gr of lever with 105 and 108 hornady bullets. I use them interchangeably

 

[Bigjake83]

I use it a lot. 27.5 gr of TAC gets me to about the same FPS as 29gr of lever with 105 and 108 hornady bullets. I use them interchangeably

What kind of accuracy you getting?

 

[jetjock07]

AR Comp is scary accurate in my 6 ARC with low single digit SD's compared to CFE223 and Lever and extremely temp stable..

What’s your speed with Comp compared to lever and cfe223

 

[padom]

2

What’s your speed with Comp compared to lever and cfe223

With 87 VMAX

30.1gr CFE223 - 2794 SD11

26.5gr AR COMP - 2790 SD 6

AR Comp almost 4gr less powder for same speed, better SD's 5 shot groups in the 0.4s.. and extremely temp stable..

I saw huge velocity swings with CFE 223 as temps changed. That's why i looked for a more stable powder and AR Comp has been the ticket.. Longshot had huge temp swings as well.

 

[jetjock07]

I’m about to start loading for the ARC but planning on 105 or 107 grain bullets. I had initially planned on either Lever or CFE.

 

[232593]

AR Comp is scary accurate in my 6 ARC with low single digit SD's compared to CFE223 and Lever and extremely temp stable..

Did you have an opportunity to run the ARCOMP in temperatures bellow 0?

 

[padom]

Did you have an opportunity to run the ARCOMP in temperatures bellow 0?

No. 20s and 80s....

 

[TonyTheTiger]

Am I the only one whose brain insists that this is a thread about 22 ARC every time it reads the thread title?

 

[232593]

Am I the only one whose brain insists that this is a thread about 22 ARC every time it reads the thread title?

Nope

 

[padom]

Nope

I did as well. It took me 5x of clicking on the thread to realize its 6 arc. Hahaha

 

[TonyTheTiger]

I did as well. It took me 5x of clicking on the thread to realize its 6 arc. Hahaha

It threw me off when I read the tested bullet weights. Even knowing it's a 6mm thread and knowing 22" refers to barrel length the title still gets every time.

 

[232593]

I did as well. It took me 5x of clicking on the thread to realize its 6 arc. Hahaha

So that said you think ARCOMP or RL15.5 would yield good results in a 22 ARC?

 

[padom]

So that said you think ARCOMP or RL15.5 would yield good results in a 22 ARC?

I would assume so... I shot a ton of 220 TB (very similar case capacity) and Varget and RE15 shined with 90smk and 88 ELD...

 

[Bigjake83]

Am I the only one whose brain insists that this is a thread about 22 ARC every time it reads the thread title?

There may have been some pre-planned trolling in the thread title.

 

[TonyTheTiger]

There may have been some pre-planned trolling in the thread title.

Well it worked, congrats!

 

[232593]

I would assume so... I shot a ton of 220 TB (very similar case capacity) and Varget and RE15 shined with 90smk and 88 ELD...

RL15 or 15.5?

 

[padom]

RL15 or 15.5?

15.. I have a bunch of 15.5 but haven't opened or played with it...

 

[Bigjake83]

Well it worked, congrats!

Fixed it for you..lol

 

[ZA206]

FYI....

B5 sells a rubberized cheek riser that snaps onto their precision stock's original movable cheek riser to give you more rise, and a larger cheek piece. It feels GREAT on your face. Highly recommend.

 

[WestTN2288]

What kind of accuracy you getting?

~1.25 10 shot groups with each. BA barrel, and I’m not the best shot off a bench. When I said interchangeable, I meant group size, velocity, everything…

 

[232593]

There may have been some pre-planned trolling in the thread title.

Well thank you for that.

Here’s some 22 ARC trolling, could I get away with a 24” 1:7 .936” + 2 gas straight taper Krieger barrel with the YHM fat cat suppressor and not suffer any accuracy degradation? Or do I need to do a 22”

 

[Bigjake83]

Well thank you for that.

Here’s some 22 ARC trolling, could I get away with a 24” 1:7 .936” + 2 gas straight taper Krieger barrel with the YHM fat cat suppressor and not suffer any accuracy degradation? Or do I need to do a 22”

Barrel length doesn't affect accuracy, just Velocity. If I was going with the above build I'd actually go with a 20" +1 or +2 Gas system.

 

[232593]

Barrel length doesn't affect accuracy, just Velocity. If I was going with the above build I'd actually go with a 20" +1 or +2 Gas system.

Gotcha I was wondering about the effect of that length with a can on barrel harmonics. I have two 24” Krieger 5.56 uppers that my crippled ass can consistently shoot the 73 grain ELDs into 1/2 MOA. No muzzle device on any of them. But I have to wonder if putting a YHM can on it would severely disrupt barrel harmonics.

Do you think I could safely get a 77 grain ALCO or a 75 grain ELD bullet to 2950-3000 fps with a 20”?

 

[Bigjake83]

Gotcha I was wondering about the effect of that length with a can on barrel harmonics. I have two 24” Krieger 5.56 uppers that my crippled ass can consistently shoot the 73 grain ELDs into 1/2 MOA. No muzzle device on any of them. But I have to wonder if putting a YHM can on it would severely disrupt barrel harmonics.

Do you think I could safely get a 77 grain ALCO or a 75 grain ELD bullet to 2950-3000 fps with a 20”?

Not sure on your muzzle velocities mileage may vary, anytime you connect something to the end of your Barrel it's going to change the barrels harmonics for Better or Worse you won't know until you try it.

 

[232593]

Not sure on your muzzle velocities mileage may vary, anytime you connect something to the end of your Barrel it's going to change the barrels harmonics for Better or Worse you won't know until you try it.

So if I got the 24” and had negative harmonic issues I could send the barrel back to Paul Ross & have him machine it down to 20” right? Reason I ask is I have never had a barrel shortened & am unsure if there are side effects.

 

[232593]

Anyone tried TAC?

You’re in Idaho right? Temps range from bellow 0 to 90s?

In the wretched cactus fucking shithole part of the country that I live temps range maybe 60 degrees from coldest to warmest. I have had 5.56 TAC loads with 77 TMKs that I developed get extreme velocity swings going from 80-100 degrees. And I wasn’t at Western Powders max charge weight.

 

[Bigjake83]

So if I got the 24” and had negative harmonic issues I could send the barrel back to Paul Ross & have him machine it down to 20” right? Reason I ask is I have never had a barrel shortened & am unsure if there are side effects.

Again I think you're kind of missing the point, whatever barrel length and muzzle device you plan on using either a muzzle break or a suppressor is going to be tuned in unison during your load development.

Paul charges $100 to cut crown and thread a barrel.

Do me a favor and please direct any further questions to PM's