Thanks to Gtscotty on our big brother forum (65Grrr), he posted Hornady's 6mm ARC bolt gun data.  Which has the expected disclaimer re: AR rifles so pay attention.

https://www.hornady.com/assets/site/horn...c-bolt.pdf

To which I thanked him and replied (directed actually at Hornady):
Now when will they make the rest of the AR data available?
We need it for 95 sst, 103 Eldx, probably a few others,
90 & 100 Eldm?
Maybe even the 87 Vmax?

Where is, repeat, where is Task Force Thirty Four? The world wonders...

Below are todays results of the next ladder of 8208xbr under the 95 grain Hornady SST.  I switched to CCI 450 primers for this work up due to the 400's having slight primer cratering, which was odd cause the 450's had more pronounced cratering and a couple of punctured primers on the upper end of the ladder.  I'll get a pic of the empties posted.

This ladder was 5 rounds at each charge weight of 8208xbr beginning with 25.4 grains and ending with 28.1 grains moving up in .3 increments.  Hornady 95 grain SST, CCI 450 primers, CBTO 1.678 and no crimp.  I almost didn't fire the 28.1 grain charge weights due to what i thought was excessive primer cratering at 27.8 grains but curiosity got the better of me so I did.

25.4 gr, avg vel 2602, sd 15.2, es 40, group 1.04"
25.7 gr, avg vel 2627, sd 9.3, es 20, group 1.33"
26.0 gr, avg vel 2661, sd 5.4, es 13, group 1.50"
26.3 gr, avg vel 2696, sd 10, es 23, group 1.25"
26.6 gr, avg vel 2711, sd 16, es 42, group 2.15"
26.9 gr, avg vel 2726, sd 5.3, es 13, group 1.10"
27.2 gr, avg vel 2775, sd 8.4, es 23, group 1.60"
27.5 gr, avg vel 2799, sd 2.9, es 7, group 2.31"
27.8 gr, avg vel 2834, sd 5.2, es 13, group 1.80"
28.1 gr, avg vel 2847, sd 11.2, es 26, group 1.28"

I know the groups could have been better if I would have taken more time on each string but the range was busy today and there were a lot of cease fires\cold line calls.

I think I'm done with this powder\bullet combination, 8208xbr is looking like it is at its limit.  Going to make up a ladder of Accurate 2520 and Hornady Leverevolution next and see where that takes me.

   
The brass is in the box left to right from lowest charge weight to highest charge weight.

PSA has ammo in stock:

- 6mm ARC Hornady Match 108 Grain ELD box of 20 for $25.99 - https://palmettostatearmory.com/hornady-...81608.html
- 6mm ARC Black 105 grain BTHP box of 20 for $24.99 - https://palmettostatearmory.com/hornady-...81604.html

I would call before ordering just to be sure it is in fact new unprimed brass , if anybody orders and receives please post back here that it is confirmed 6 ARC brass.

Too expensive for me after shipping and credit card fees.

https://www.gunbroker.com/item/876883344

Here's a video of guy talking about taking a ho with the ARC

https://youtu.be/fzoBfDdX5Gk

The objective was to get 2850 fps - DIDN'T ACHIEVE THE OBJECTIVE.

***Note there is NO load data available for this combo of bullet, powder, and primer - I essentially worked off of 6mm PPC data and extrapolated the hell out of things to derive starting loads.

I am familiar with 90 grain loads and velocities in 6.8 SPC and 6.5 Grendel - so using those as a ceiling I aimed for a slightly less velocity out of the smaller 6mm ARC case.

At this point I intend to refine the load and await published data to see if I am close to safe loadings.

Velocity Readings:

26.0 grains - 2546 / 2540 / 2575 FPS
26.5 grains - 2574 / 2573 / 2555 FPS
270. grains - 2650 / 2633 / 2604 FPS
27.5 grains - 2669 / 2684 / 2665 FPS
28.0 grains - 2734 / 2730 / 2709 FPS
28.5 grains - 2793 / error / 2795 FPS
29.0 grains - 2801 / 2814 / 2796 FPS

This video popped up on youtube today.  I had never seen it before.  C Products Defense announcing their 20 round 6.5 Grendel Duramag.  I didn’t notice anything about functioning in 6 MM ARC.


https://www.youtube.com/watch?v=kPmGu23enOo

On 8/3/20 Hornady announced they filled an additional DoD contract for 6mm ARC I believe it's for the TAP ammo 

7/23/20 
Hornady won a contract for an unspecified amount of 300blk TAP sub-sonic ammo for a DoD entity.  

Hornady have been busy selling a couple Boxs of ammo to the DoD ? I sure would like to find out who's using ARC.

SGAmmo.Com has about 60 box's of the 108gr Match 6mm ARC ammo instock. For anyone who has there platform setup or is looking to get ammo before hand. 

Hope this helps some of you out!  

-AM