New 6mm Advanced Rifle Cartridge

[BurtG]

Is there a thread for this round in the bolt gun section? Loving it in semi-auto and thinking about building a light weight bolt gun.

get a fix.

Handiest bolt gun around

 

[phantasm]

She's a shooter. Sub-MOA with factory loads; took it out to 1,025 yards today. The 6 ARC is growing on me ... a lot.

 

[5RWill]

She's a shooter. Sub-MOA with factory loads; took it out to 1,025 yards today. The 6 ARC is growing on me ... a lot.

View attachment 8727062

What bullet/ammo?

 

[phantasm]

What bullet/ammo?

I shoot mostly Hornady Black 103gr and Hornady Match 105gr. About to start working up a handload for it here when I have time.

 

[Gtscotty]

Finally got the X-Caliber 13", mlgs lightweight barrel that I ordered back in March in. Going to try a BFK Mod 0 thermal fit upper and reuse a 12.7" Aero handguard I have on this one. Waiting for Rexus Ultra bolts to come back in stock in the next few weeks and should be in business.

 

[Dogtown]

get a fix.

Handiest bolt gun around

Indeed - MiniFix in 6ARC with a Proof Carbon barrel is the handiest bolt gun in my collection. I can strip it down to just the 3-20x and lug it up and down the mountains like it's no big deal at all.

Or I can load it up with some craziness...

 

[Dogtown]

Oh and I'll add, I've now gone through a number of different barrel lengths in semi-autos - from 26" to 20" to 16" to 12". I really think with anything longer than 16" you rapidly hit a point of diminishing returns with this cartridge. Granted, I'm not using commercial ammo, so maybe that'll run better, but my own 103 ELD-X / 105 Hybrid / 109 LRHT loads don't see a significant boost in velocity past 16", at least not the 25fps / inch expectation you see with other rifle/cartridge combos. I just started shooting the 12" and it's crazy how a shorty can essentially perform like an old school full size Mk12.

 

[db2000]

Indeed - MiniFix in 6ARC with a Proof Carbon barrel is the handiest bolt gun in my collection. I can strip it down to just the 3-20x and lug it up and down the mountains like it's no big deal at all.

Or I can load it up with some craziness...
View attachment 8731851

Damn, save some pussy for the rest of us!

 

[BurtG]

Oh and I'll add, I've now gone through a number of different barrel lengths in semi-autos - from 26" to 20" to 16" to 12". I really think with anything longer than 16" you rapidly hit a point of diminishing returns with this cartridge. Granted, I'm not using commercial ammo, so maybe that'll run better, but my own 103 ELD-X / 105 Hybrid / 109 LRHT loads don't see a significant boost in velocity past 16", at least not the 25fps / inch expectation you see with other rifle/cartridge combos. I just started shooting the 12" and it's crazy how a shorty can essentially perform like an old school full size Mk12.

And here I have a 22” ar barrel on the shelf for a gas gun comp build when the m lol Vltor vis gets released

 

[Tex68w]

I love my 14.5", it didn't give up much over the 18" I ran prior. Now I need to decide on a proper 22ARC barrel for the next build.

 

[Rob01]

Oh and I'll add, I've now gone through a number of different barrel lengths in semi-autos - from 26" to 20" to 16" to 12". I really think with anything longer than 16" you rapidly hit a point of diminishing returns with this cartridge. Granted, I'm not using commercial ammo, so maybe that'll run better, but my own 103 ELD-X / 105 Hybrid / 109 LRHT loads don't see a significant boost in velocity past 16", at least not the 25fps / inch expectation you see with other rifle/cartridge combos. I just started shooting the 12" and it's crazy how a shorty can essentially perform like an old school full size Mk12.

So what were the velocities with the same loads and different barrel lengths?

 

[db2000]

I have read that 18 was optimal but that’s been a couple years and maybe factory only ammo, although I’m not entirely sure why hand loading would make a shorter barrel have less delta than factory ammo

 

[Dogtown]

So what were the velocities with the same loads and different barrel lengths?

Looking through my log books...

105 Hybrid 29.5gr LVR
26" 2650 fps
20" 2575 fps
16" 2500 fps
12" 2385 fps

 

[db2000]

10/11/24
72F 26% 30.14in

18” Proof and LVR 30.0, 29.3 respectively
2680+ 103 ELD-X
2620+ Berger 108 EH

 

[Dogtown]

I really like the 103 ELD-X for 6ARC, and I'm just banging steel and not dropping animals.

 

[Tex68w]

I lost 40fps with 108's going from 18" to 14.5"

 

[Tex68w]

I lost 40fps with 108's going from 18" to 14.5"

 

[supercorndogs]

Looking through my log books...

105 Hybrid 29.5gr LVR
26" 2650 fps
20" 2575 fps
16" 2500 fps
12" 2385 fps

I was just wondering about 12".

 

[carbonbased]

Looking through my log books...

105 Hybrid 29.5gr LVR
26" 2650 fps
20" 2575 fps
16" 2500 fps
12" 2385 fps

What’s 0.25” CHOAD look like?

 

[db2000]

I lost 40fps with 108's going from 18" to 14.5"

What’s your velocity at 14.5?

 

[Mike_in_FL]

She's a shooter. Sub-MOA with factory loads; took it out to 1,025 yards today. The 6 ARC is growing on me ... a lot.

View attachment 8727062

Sorry to sidetrack but if this is on a range, where is it?

 

[Tex68w]

What’s your velocity at 14.5?

It has settled to a 2465 average with factory 108's.

 

[db2000]

It has settled to a 2465 average with factory 108's.

Wow. Yeah, pretty similar.
I shot some last fall just because I had a couple boxes laying around. Here’s what I got.
Hornady 108 ELDM Factory
2504, 2506, 2480, 2472, 2445
2505, 2492, 2488, 2480, 2463
2498, 2517, 2511, 2513, 2510
2479, 2511, 2487, 2508, 2494
SD 18.5 ES 72 2”

 

[5RWill]

I love my 14.5", it didn't give up much over the 18" I ran prior. Now I need to decide on a proper 22ARC barrel for the next build.

I think for 22 ARC 18" is it. 2850 with 88gr eld m is a commonplace with factory ammo. I guess you could do 16" and run 2700 or so. I'm sure if you're loading that's different but it just doesn't seem to hold velocity as well as the 6 ARC when chopping the barrel. I know I'll be going 16" for my 6 ARC