270AR SPR (New AR-15 cartridge coming this fall)

[Xcountryrider]

If we are forced to go to all copper then 200FPS will make a big difference because those copper bullets require higher impact velocities than the normal 1800FPS to open.

[russ69]

xcountryrider,

Is there really enough length in the magazine for good long range bullets and loads? With the 6mm leading the way in target shooting circles are the highpower guys really going to want the added recoil over a 6xc or similar cartridge?

[John Browning]

Harrison knows what he is doing. I hope that this wins up going past the wildcat stage.

[Xcountryrider]

xcountryrider,

Is there really enough length in the magazine for good long range bullets and loads? With the 6mm leading the way in target shooting circles are the highpower guys really going to want the added recoil over a 6xc or similar cartridge?

You have to use the 6.8SPC PRI mags. I think this will be primarily a hunting round.

[russ69]

You have to use the 6.8SPC PRI mags. I think this will be primarily a hunting round.

That's what I was thinking.

Edit: I have four 6.8 SPCs, a mini-14, two ARs and a Contender.

[constructor]

xcountryrider,

Is there really enough length in the magazine for good long range bullets and loads? With the 6mm leading the way in target shooting circles are the highpower guys really going to want the added recoil over a 6xc or similar cartridge?

The 6XC has more case capacity than the 270AR does..it will recoil more with a 105 Lapua but this has nothing to do with highpower shooting. The 270AR has the same capacity as the 30 Remington AR but uses lighter .277 bullets with higher BCs. The only cartridges that fit in a AR15 and are more powerful are the wssms, Socom and Beowulf. There are about 50 million more hunters than there are highpower shooters why would I target a small crowd like high power shooters or any other shooting sport for that matter?
The 270 AR was the best performing hunting cartridge I could come up with without going to the wssm style that must use a thinned out receiver and cutting the ejection port open and all the other odd stuff that must be done.
I hear so much BS about the Grendel, a high BC doesn't kill animals. A Grendel with a 20" barrel shooting 130 Noslers is good for about 400yds, that is where that nosler drops below 1800fps and goes under the threshold of expansion. The 270AR shooting a 130 Nosler is good to over 500yds, it's still going 1843fps at 500yds and has right at 1000 ft lbs energy. Using the same weight bullets the 270AR starts out about 350-400fps faster than the Grendel.

[Xcountryrider]

The 6XC has more case capacity than the 270AR does..it will recoil more with a 105 Lapua but this has nothing to do with highpower shooting. The 270AR has the same capacity as the 30 Remington AR but uses lighter .277 bullets with higher BCs. The only cartridges that fit in a AR15 and are more powerful are the wssms, Socom and Beowulf. There are about 50 million more hunters than there are highpower shooters why would I target a small crowd like high power shooters or any other shooting sport for that matter?
The 270 AR was the best performing hunting cartridge I could come up with without going to the wssm style that must use a thinned out receiver and cutting the ejection port open and all the other odd stuff that must be done.
I hear so much BS about the Grendel, a high BC doesn't kill animals. A Grendel with a 20" barrel shooting 130 Noslers is good for about 400yds, that is where that nosler drops below 1800fps and goes under the threshold of expansion. The 270AR shooting a 130 Nosler is good to over 500yds, it's still going 1843fps at 500yds and has right at 1000 ft lbs energy. Using the same weight bullets the 270AR starts out about 350-400fps faster than the Grendel.

The Nosler Accubond Long Range expands down to 1300fps per company figures. They make a 129gr with a BC of .561. That should be a good Grendel hunting round but it would be better if it was a 123gr for the grendel. That said the 270AR is just going to be a better hunting round even though i've lost no love for my Grendel's. Can't one be a fan of both?

http://www.nosler.com/accubond-long-range/

[that guy]

The 270 AR was the best performing hunting cartridge I could come up with without going to the wssm style that must use a thinned out receiver and cutting the ejection port open and all the other odd stuff that must be done.

So, no need to open up the ejection port like the SOCOM?

[constructor]

The Nosler Accubond Long Range expands down to 1300fps per company figures. They make a 129gr with a BC of .561. That should be a good Grendel hunting round but it would be better if it was a 123gr for the grendel. That said the 270AR is just going to be a better hunting round even though i've lost no love for my Grendel's. Can't one be a fan of both?

http://www.nosler.com/accubond-long-range/

You found the answer, you don't need a 270AR. It would be a lot easier to use the Grendel with that bullet and not buy dies and have to form cases and spend money on another upper to do the same thing. What is the energy of that 130 going 1300fps, about 490ft lbs? They make a .277 150 Nosler LR too BC .625, that 150 would start off faster than the Grendels 129gr at apx 2550.

That guy, the port does not need to be enlarged. It uses standard carriers, the only difference is the bolt and extension on the barrel.

[that guy]

That guy, the port does not need to be enlarged. It uses standard carriers, the only difference is the bolt and extension on the barrel.

What kind of pressures can you load your 800 series bolt / extension sets too?
Both 30AR and the smaller faced 6BR? Thanks.

[Xcountryrider]

What kind of pressures can you load your 800 series bolt / extension sets too?
Both 30AR and the smaller faced 6BR? Thanks.

60k

Sent from my MB860 using Tapatalk 2

[Xcountryrider]

You found the answer, you don't need a 270AR. It would be a lot easier to use the Grendel with that bullet and not buy dies and have to form cases and spend money on another upper to do the same thing. What is the energy of that 130 going 1300fps, about 490ft lbs? They make a .277 150 Nosler LR too BC .625, that 150 would start off faster than the Grendels 129gr at apx 2550.

That guy, the port does not need to be enlarged. It uses standard carriers, the only difference is the bolt and extension on the barrel.

Easier yes but as fun? No...

Sent from my MB860 using Tapatalk 2

[constructor]

What kind of pressures can you load your 800 series bolt / extension sets too?
Both 30AR and the smaller faced 6BR? Thanks.

I've been running a 6BRX and 6.5BRX (rim dia .473)since 09 so hot it makes Lapua cases bulge...60k. The 6BRX will push a 95gr SMK to 3200fps out of my 22"barrel, 105 Lapua's to around 3050fps. The 6.5BRX will push a 123gr to 2800-2850 out of a 20". The BRX cases have apx 2 gr less capacity than the 270AR but the bolt thrust is the same if run at the same pressure.
There are a few guys using the bolts to make 30 Remington ARs, and cats off of them. They say they run full pressure but I have no idea what kind of performance that is.

[that guy]

I've been running a 6BRX and 6.5BRX (rim dia .473)since 09 so hot it makes Lapua cases bulge...60k. The 6BRX will push a 95gr SMK to 3200fps out of my 22"barrel, 105 Lapua's to around 3050fps. The 6.5BRX will push a 123gr to 2800-2850 out of a 20". The BRX cases have apx 2 gr less capacity than the 270AR but the bolt thrust is the same if run at the same pressure.
There are a few guys using the bolts to make 30 Remington ARs, and cats off of them. They say they run full pressure but I have no idea what kind of performance that is.

Thanks. Moved follow up question to PM to avoid thread jack...

[Xcountryrider]

I've been running a 6BRX and 6.5BRX (rim dia .473)since 09 so hot it makes Lapua cases bulge...60k. The 6BRX will push a 95gr SMK to 3200fps out of my 22"barrel, 105 Lapua's to around 3050fps. The 6.5BRX will push a 123gr to 2800-2850 out of a 20". The BRX cases have apx 2 gr less capacity than the 270AR but the bolt thrust is the same if run at the same pressure.
There are a few guys using the bolts to make 30 Remington ARs, and cats off of them. They say they run full pressure but I have no idea what kind of performance that is.

If one was to build a 30ar using your 800 series bolt where would you get a barrel and would it shot commercial 30ar ammo?

Sent from my MB860 using Tapatalk 2