Just recently completed an AR15 in 6mm ARC. Got a 16" Rosco barrel, Odin works adjustable gas block, Aero Precision enhanced upper, JAG composites 15" bertha handguard on a PSA lower with a Geissele SSA-E trigger and magpul PR MOE stock. Has a Discoveryopt 5-25x56 ED PRS2 scope on a 20moa Discoveryopt cantilever scope mount. I just got approved for a suppressor and am picking up an Otter Creek Polonium Saturday. I have a 6.5 grendel AR, but am wanting to get into long range with a more compact AR15

Curious if anyone has results in the 6mm ARC with Big Game oowder.
Seems like a good fit for the cartridge in regards to case fill and burn rate.

Here is list of 6mm bullets I have.

Hornady 105 BTHP 3 box of 100
Sell for $25 per box

Barnes 112 MatchBurners 2 box of 100
Sell for $25 per box

Nosler 105 RDF bulk 220
Because this is bulk Ill sell for .20 each or $44.00

 Delivered lower 48.

Hi everyone. New member here from South Florida. Long time shooter, newbie reloader. Got into 6arc about a year ago and just recently started reloading for it. Just want to thank all of you for this great resource and looking forward to be able to continue learning from all of you and maybe someday provide some useful info for you all.

For Sale. Vortex Razor HD Gen lll 1-10X24 MSRP EBR-9 MRAD
12-21-2024, 12:47 PM
   


Price lowered to $1700.

Like new in box.

Vortex Razor HD Gen lll 1-10X24 MSRP EBR-9 MRAD first focal plane $3999.99
Vortex 34mm cantilever scope mount. MSRP 229.99

Will sell for $1,700 delivered to lower 48

My poor eyesight just doesn't work with the scope. I bought this last spring and only shot with it once. This is a great scope and you will never find it at this price. The Vortex warranty never runs out no matter who owns the scope.

Cheers

hey I have a problem I have a odin works 18 inch barrel diamondback upper and lower diamond back bolt I can not get it to cycle I have tried heavier and lighter buffer multiple different gas blocks the rifle was a 6.5 Grendel before I changed barrels can anyone think of anything that I could try to get it to cycle the farthest the bolt comes back after firing is the back of the bolt is even with the back of the mag will not lock back on last round rifle shoots like a dream I am running Hornady 103 eldx over 28gr of varget for a load thank you

I've never been a fan of Hornady brass because I've always found it to have worst in class weight variation, and weight variation equals internal case volume variation which leads to velocity variation. I now have some hard stats on a very meaningful sample to share.

A squad buddy built an ARC late last year and has been shooting Hornady factory ammo. He has been incredibly kind and given me his 1x practice brass and I get to pick up his 1x match brass. Nothing beats free brass! With 450 cases on hand (with more coming monthly) and my lot of Starline at 4x (I'll run it to 5-6x), I started to get to work on it.

I decapped and weighed about 40 pieces, tossed a few outliers out of the weight pool and came up with an average of 116.9 grains. For ease, I decided upon 116.0 to 118.0 as the weight range for my "match brass". That will be better than using Starline without sorting, and Hornady's primer pockets do seem to last a little longer then the 5-6x I get out of Starline. I segregated the >118.0 and <116.0. Seeing a lot of the lighter brass fall into 115.0 - 115.9, I further segregated that. This was the result:

>118.0              6.4%
116.0 - 118.0   73.1%
115.0 - 115.9   11.5%
<115.0             9.0%

I found it interesting that more light brass deviates from the mean than heavy, but this is probably explained by whatever process is used to make the ferrules the brass is drawn out of. I'll note that 120.0 was the max I found. 

What was most interesting was the amount of outliers on the low end. 6 pieces (1.3%) were in the 111.0 - 111.9 range. Yes one was 111.0 - that's over 5% lighter than the mean. Many more were in the 112s and 113s.

So when shooters wonder where their flyers come from, this is certainly an explanation for some. It's also an example of why more attention should be paid to SD rather then ES when analyzing load velocity variation. If you have the misfortune of having one of the outliers in your sample, its going to blow out the ES a lot more than the SD. Its also going to blow out the SD a lot more for a small sample size than a large one. You may end up ruling out a good load out of what would literally be due to "bad luck".

It will be a while, but once I develop a load for the match lot, I'll drop it in the six 111.0-111.9 cases and compare the results of those with the match lot. Who knows, maybe I'll (we'll) be pleasantly surprised by the delta. 

Assuming that the free brass keeps coming, I'll also update the pool as it gets larger.

I've had my Gen 2 for a bit now, and it is experiencing sporadic ejection issues. There isn't any rhyme or reason to it. It will sometimes eject flawlessly, and then the empty case will just drop in the breech. 

The bolt face diameter measures .454", which I don't know is good or bad? I called Ruger customer service and they wouldn't give me the specified dimension. They are sending me a new extractor, spring, and detent ball. Hopefully this will fix it, but if it doesn't I reckon I will be sending it in. 

It also has issues feeding the last round in the magazine. I will update once the new parts are installed. 

If anyone with a 6 arc bolt gun wants to measure the bolt face diameter and PM me, I would appreciate it.

Hello everyone I just built a gas gun with a 20” tactical kinetics barrel and an adjustable gas block. It also had a mill spec 3oz buffer and spring. During the initial test shots the gun cycled just fine with the gas almost all the way down. The brass was ejecting about 4 to 5 o’clock but more word 5. On the last round the bolt did not lock back. After adjusting the gas block basically almost all the way open I finally got it to lock back but only on a Duramag it would not lock on an ASC mag. Any ideas of what I can try? I thought it was under gases but the ejection pattern never changed the whole time I was adjusting the gas block.

Howdy!  New member here from N Florida. Just got my 6mm gas gun put together. Very interested in this round. I know forums don’t get much use anymore seems like more people are using the FB groups, but I just wanted another resource for this cartridge