Anyone running 6ARC?

11B CIB

11B CIB

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I’ve got a 16” 5.56mm rifle w/ Shilen blank barrel that’s not filling a role anymore; if I’m shooting precision 5.56 I normally grab my 20” rifle.

Debating swapping it for a 6ARC barrel to use for hunting and longer range shooting.

I’m really interested in a 16-18” carbon fiber Proof Research barrel mainly to make it as light as possible (will be using a lightweight suppressor with it) for carrying for long periods of time. Not opposed to a stainless barrel but the weight savings of the Carbon fiber Proof barrel is appealing

I figure I can use 90-100gr bullets for hunting to keep some velocity going in the shorter barrel. I know with the popularity of 6mm in general, supplies can be hit or miss on precision bullets but I found 90 and 95gr Bergers pretty easily.

Any feedback would be appreciated
 
No personal experience with the 6ARC. But, (there's always a but/butt), from my reading on it, it's a great target round equivalent to the 6.5 Grendel in many ways. However, the 6.5 Grendel, while a good target round, makes a better hunting round.

6ARC >= 6.5G for target
6.5G > 6AR for hunting

if that makes sense.

Coincidentally, I have a complete upper in 6.5G in the BST. I'd let you borrow it to try out if you want.

120-129 class for hunting out to 400+ from a 16". 90-123 class for varmint and target

ETA: There are a few threads of discussion on 6ARC vs 6.5G over on the Grendel forum.
 
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I’ve got a bolt gun in 6ARC. I don’t have enough time on it to give any honest opinions. But I like what I have seen from the cartridge so far.
 
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I built a Mk12 Mod 1 in 6 ARC, and it's done really well with reloads. I gave it to a buddy of mine in AZ and he sent me back a bunch of pictures of .3" 5-shot groups from load development. It's a really sweet round to build an AR off of.
 
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The availability of brass and projectiles for 6.5 grendel would make the decision easy for me….6.5 grendel. However the 6 arc looks nifty too, I just like to have plentiful brass supply.
 
DS1911 said:
The 22-250 and 22Br that people have been running seems to be 2200-2500 rounds on a barrel.

Thats not terrible and would last 90% of people their life time
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Yeah. My mistake. I had read something the other day on the 22CM and confused it with the 22ARC.
 
I’d like to try the 6mm over 6.5 to retain some speed in a shorter barrel.

22ARC is kind of interesting but it’s not a whole lot faster than my 20” .223 (it’s doing everything I could do with my 224Valkyrie while keeping barrel and brass life) so the juice isn’t worth the squeeze for what I’d gain there versus stepping up to 6mm.
 
11B CIB said:
I’d like to try the 6mm over 6.5 to retain some speed in a shorter barrel.
Click to expand...


From a post on the Grendel forum

12” 6mm ARC
6mm 108gr ELD-M, 2350fps hand load with CFE223 or LeverEvolution, 23.8” Hg (higher altitude/lower air density where I shoot a lot), 59 deg F

300yds 1981fps 941ft-lbs 1.4 mil drop .5 drift
600yds 1643fps 647ft-lbs 5.0 mils / 1.1 drift
800yds 1437fps 495ft-lbs 8.1 / 1.6
1000yds 1270fps 387ft-lbs 11.3 / 2.0
1150yds 1118fps 300ft-lbs 15.2 / 2.6
1200yds 1085fps 283ft-lbs 16.4 / 2.7

12” 6.5 Grendel
107gr SMK, .230 G7 BC model, 2475fps hand load with IMR 8208XBR (~ 49,000psi), 23.8” Hg, 59 deg F

300yds 2053fps 1001ft-lbs 1.4 / 0.6
600yds 1673fps 665ft-lbs 4.7 / 1.3
800yds 1441fps 494ft-lbs 7.7 / 1.8
1000yds 1225fps 356ft-lbs 11.3 / 2.5
1150yds 1099fps 287ft-lbs 14.6 / 3.1
1200yds 1077fps 276ft-lbs 15.9 / 3.2
 
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