AR Precision

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Progressing with the 30 HAR dialing in at 2600+ FPS pushing a 110 grn Hornady projectile.

 

[mustang979]

I'm working on a 5.56 precision AR myself, I borrowed a scope and fired some match ammo thru it just to see. It's pretty impressive what good AR with a high end barrel can do with even Match ammo. Who type of a barrel are you running?

 

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Jury Customs from Red Deer.

 

[EHG]

I'm familiar with the 30 AR. What's the difference of 30 HAR?

 

[redshooter]

The shoulder looks like it's greater than 25 deg. Improved 30 AR?

How does it feed/extract?

 

[ntm]

Are the ballistics not terrible on the 110's at 2600 ?
I run them out of my 16" 308 ar at 2900, and they aren't very good in the wind. A 175 or 155 Scenar outperforms them easily at distance.
i just don't see the point of the cartridge, it's basically a 7.62x39 with a precision based build.

 

[Sqr]

The shoulder looks like it's greater than 25 deg. Improved 30 AR?

How does it feed/extract?

The 30 HRT/HAR has a 30 deg shoulder and has a 1.570-1.60 case length compared to the 1.50 and 25 deg shoulder of the 30 AR. The 30 HAR is based on the AR 6.8 SPC parent case and borrows the dimensions from the 30/30 cased TC single shot pistol 30 Herrett wildcat.

The optimum projectiles used are the 110-125-130 and for hunting the 150's. The green tipped cartridges in the picture are the 125 grn Noslers which are the most accurate. I have used the 125 Barns X but are very Expensive.

The 20" Jury Custom barrel is a rifle length gas system and functions well with the proper load. However It is sensitive with particular powder charge weights. If I had to do it all over again I would select a mid length like my other 30 AR that is pictured from Tennessee's ARPerformance.com (ARP).

 

[Sqr]

Are the ballistics not terrible on the 110's at 2600 ?
I run them out of my 16" 308 ar at 2900, and they aren't very good in the wind. A 175 or 155 Scenar outperforms them easily at distance.
i just don't see the point of the cartridge, it's basically a 7.62x39 with a precision based build.

This is based on the AR-15 action using the rifle length gas system. The case uses the new 6.8 x 43 Remington SPC round necked-out to 7.62 mm calibre (and retains the original headstamp). As such, it requires the use of dedicated magazines and bolts. The key advantage the .30 HRT offers over the 6.8 mm is flexibility due to the wide range of .30 calibre bullets available. These range from the 110 grain (7.1g) Hornady V-Max (as shown in the photo; at about 2,700 fps - 820 m/s) up to 240 grain (15.6g) Sierra Hollow Point Boat Tail, loaded to subsonic velocities to rival the specialist .300 AAC.

The 20" Jury Customs barrel has a 1/10 rifling and the 16" ARP barrel is a 1/11.25 5R rifling.

The only only thing in common with the 7.62 is it can use that particular rounds loading data as a starting point. This round has superior performance to the 39 and is a little lower to a .308 in an AR platform.

Typical loads are:

31gr 1680, 110TSX loaded to 2.295=2678fps
32gr 1680, 110TSX loaded to 2.295=2796fps

125gr Nosler Ballistic tip loaded to
loaded to 2.295, 31gr 1680=2678fps
110gr Barnes TSX loaded to 2.295, 32gr 1680=2796fps

Powders range from Rel 7, I4198, H4198, H4895, H335, H322 and AA1680 which the Cat was developed around.

Next on the procument front is a good trigger as that should help.

As a comparison there is a 556, 6.8 SPC then the 30 HAR/HRT's, 30 Herrett, two 7.62's and followed up by the 308.

The 30 HAR/HRT's are in 3 110's, a Nosler 125, a Barnes 125, a Speer 130, Speer 180 and a cast 165.

 

[Shibby!]

I think you are measuring your groups wrong. I first thought, inside to inside, plus caliber. I can't quite understand what you are doing on your second grouping picture though...

Either way, nice rifles and shooting. Hope to do some testing with my AR coming up soon. It's shown some promise.

 

[Sqr]

I think you are measuring your groups wrong. I first thought, inside to inside, plus caliber. I can't quite understand what you are doing on your second grouping picture though...

Either way, nice rifles and shooting. Hope to do some testing with my AR coming up soon. It's shown some promise.

You are correct about the measuring as I should have been more careful when placing the VC for a reference.

 

[Shibby!]

Not a big deal, still very good groups. I was just stuck on trying to understand what was being measured. haha.

Anything you plan on changing in an attempt to increase accuracy?

 

[bsand]

If you want an excellent trigger Geissele hi-speed National match - match rifle. I have that and the spring kit for service rifle (currently installed). But boy is the match trigger Springs ever light and crisp. It's fully adjustable sear, so you can tune the break icicle or carrot. The 2 stage is awesome long 1st short crisp 2nd, It's really a joy to shoot.

 

[ntm]

This is based on the AR-15 action using the rifle length gas system. The case uses the new 6.8 x 43 Remington SPC round necked-out to 7.62 mm calibre (and retains the original headstamp). As such, it requires the use of dedicated magazines and bolts. The key advantage the .30 HRT offers over the 6.8 mm is flexibility due to the wide range of .30...

I was asking why not just run a 308 or 6.5/.260 in one of the more modern small frame 308 ar's like the dpms g2 or Daniel defense ?

 

[Sqr]

Not a big deal, still very good groups. I was just stuck on trying to understand what was being measured. haha.

Anything you plan on changing in an attempt to increase accuracy?

I have a Geissele SSA in my race AR however was looking at and considering the Hiperfire Hipertouch 24c for this rifle. I will investigate more on the suggested HS National Match.

 

[Sqr]

I was asking why not just run a 308 or 6.5/.260 in one of the more modern small frame 308 ar's like the dpms g2 or Daniel defense ?

They are good rifles but still a tad on the large and heavier side. I am a Thompson Contender guy and already have the reloading equipment on hand so it was a smooth transition.

 

[tactical_tech]

Nice looking rifle, very similar to my precision AR.

 

[ntm]

They are good rifles but still a tad on the large and heavier side. I am a Thompson Contender guy and already have the reloading equipment on hand so it was a smooth transition.

Ah.
The g2's are damn near indistinguishable from a 223 ar except for the larger mag well. Try one on for size, you'll be surprised at the weight and feel.

 

[Sqr]

Nice looking rifle, very similar to my precision AR.

Where's the Like button?

 

[Sqr]

Went out on a fantastic shooting day today to try my hand at entering the forum precision competition. Started off well with the first two five shot groups and decided to walk the 100 yards to check on my progress. Well big mistake as it took me nearly 8 shots to get back into a rhythm. It is obvious how a mil spec trigger reacts to a stressor, even ever so slight.

The bottom two are before my walk and the top two immediately following the 200 yards. The centre is once I regained my concentration. Lesson learned

 

[redshooter]

Nice shoot'n!!!