Long Range AR-15 Caliber: Which One?

[Dr. Tad Hussein Winslow]

OK, so which is better and why:

1. 6 H
2. 6 AR
3. 6 BR
4. 6 BRX
5. 6 XC
6. 6 WOA
7. 6x45mm

?? The WOA looks like it has the largest case capacity, followed by the BRX and then the AR. The 6 H and 6 XC are not shown in the pic.

Wow, curse you guys - now I'm going to have to figure out if I want a Rob XCR in 5.56 or a custom AR upper in one of these crazy near-.243 win calibers. Anyone got a review or more in-depth comparison? What about mags and feeding reliability, etc.? Thanks.

 

[gvnwst]

the site didn't say what the WOA was. what is it???

 

[gvnwst]

i want them all. i really should stop looking at their site.

 

[Howard Roark]

6mm/6.8 SPC/WOA - Water capacity 33.5 - 34 gr
6mmAR - Water Capacity 36 gr
6mm AR Turbo - Water Capacity 37 gr
6mmAR Turbo 40 deg IMP - Water Capacity 37.5 - 38 gr
6mm HAGAR - Water Capacity 37.5 - 38 gr
6mmBR - Water capacity 38 gr
6mmBRX -Water cpacity 43 gr
6x45/6mm-.223 -I don't have capacity data but it is sure to have less than the above.
6XC is based on a 22-250 and doesn't fit an AR15.

All of the above except for the 6BR is made from some other brass. The 6BR will feed 105's from the mag. We got 4 mags from the first run and one is dud. It is being sent back. There was some confusion on the first production run of mags and they came in crome plated not matte finished. We will see if the latest run is perfect.

 

[Dr. Tad Hussein Winslow]

The 6BR will feed 105's from the mag.

But the 6 BRX won't?

Thanks very much. The BRX doesn't LOOK like it has more capacity than the WOA, but it definitely does.

 

[Howard Roark]

The 6BRX will feed from the mag. It has the same case length as the parent case. Only the shoulder is pushed forward.

 

[SpeedAKL]

.308 is a popular option

DPMS also offers .260 Remington and 6.5 Creedmor. Armalite offers .300 Remington SA Ultra Mag. 6.5 Grendel will get way out there as well.

 

[gvnwst]

.308 is a popular option

DPMS also offers .260 Remington and 6.5 Creedmor. Armalite offers .300 Remington SA Ultra Mag.

that is AR 10, not 15

 

[gvnwst]

The 6BRX will feed from the mag. It has the same case length as the parent case. Only the shoulder is pushed forward.

i really want one

 

[Howard Roark]

The only thing I don't like about the BRAT rifle is that they use the standard Olympic flat top upper. I wish I could get the bolt, carrier and barrel extension only. That way I could ream out one of the thick sidded DPMS uppers to accept the larger barrel extension and have a more rigid system with out the useless forward assit.

 

[trstafford]

it's the bullet weight

The reason .223 is working so well at 1,000 yds is the very heavy bullets used along with the fast twist barrels.

 

[rrflyer]

Why dont you just get a .50BMG upper for it?

 

[gvnwst]

Why dont you just get a .50BMG upper for it?

Not mag fed, way more $$$, and too much kick. And not as accurate as the cartridges we have discussed here.

 

[gvnwst]

Howard

how do you make the BRX brass? Just fireform in chamber?
Thanks

 

[jerkface11]

Model One Sales makes a 6mmPPC upper.

 

[Howard Roark]

how do you make the BRX brass? Just fireform in chamber?

Yes, Just load up a 6BR and pull the trigger.

 

[gvnwst]

so i can shoot factory ammo and the improved ammo? How do i order

 

[Howard Roark]

I wouldn't count on the best accuracy while fire forming brass. I would use a light bullet loaded moderately. Call Eric and talk to him.

What kind of LR competition are you looking to get into?

 

[gvnwst]

not a clue, i have a several hundred yard range that i am going to practice on before starting to compete. Does F-class allow use of semi auto rifles? Maybe tactical matches or something like that....

 

[Howard Roark]

F-class allows bottom feeders. The rifle we are talking about would be in the Open class.

F-Class information.

 

[gvnwst]

thanks for the link.