6mm and 6.5mm AR-15s.

M

Mr_Brass

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Apr 10, 2010
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45x90 WI.
#1
As the title says, I would like some information about 6 and 6.5mm ARs. I am not looking to get into an AR10 but I hear there are many 6mm cartridge that will stomp a 308 in ballistics. I want something to get out to about 800 yards or so. also would like a good amount of stopping power. (why not right?)

here is what I know of right now.
6mmAR
6mmAR 40*
6 WOA
6.5 Grendel

I understand these are wildecats (- the 6.5) but is there really no way to get a 6mmAR turbo barrel and build my own upper? the uppers I have seen are in the $1700 range.

If there are any other calibers I would like to hear them.

Thanks
 
#2
Re: 6mm and 6.5mm AR-15s.

Buy a barrel and have a smith who has the reamer for the chamber you want chamber, thread, port and profile the barrel? Thats what I did.

Accurate And Reliable Rifles. Lee Wells, AR smith.

Consider 6Rat?
 
#4
Re: 6mm and 6.5mm AR-15s.

never heard of the 6 rat. I am mainly looking for whatever is good in a AR-15 platform. something with pretty good barrel life and effective out at around 800 yards.

how hard is it to get reamers? I have a smith in town that does all my work.

I am really liking the 6mmAR turbo though. maybe get my 6X45 reamed out to that???
 
#7
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mr06</div><div class="ubbcode-body">hmmm alright. I'll have to see how much they cost. and hey did you send me an email earlier? </div></div> Yes sir.
 
#10
Re: 6mm and 6.5mm AR-15s.

Getting ready to build 6.5 BRX and 30 BRX on ar-15 platform....both based on 6BR cartridge,necked up.
Will shoot 123 gr SMKs in the 6.5 and 155 Lapua in the 30.
I've built both cartridges on bolt actions already.
Both should romp on the PPC based cartridges listed with the downside of reduced capacity in mags.
1xs copy.jpg


pic of 20BRX(fantastic varmint round),6.5 and 30 BRX next to 6BR.
If these pan out the 338 Whisper is next.
 
#11
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 42769vette</div><div class="ubbcode-body">have you considered the 260? </div></div>

i have thought about the 260 as well as the 6.5 creedmoor.

However after really thinking about it getting an AR 10 is a bit out of my budget right now. so I would like to stick with the AR-15 type rifles.

If I went with a bolt gun I would probably go with a 6.5-06 hear they have outstanding barrel life.
 
#13
Re: 6mm and 6.5mm AR-15s.

I am perfectly content with the Grendel round in a standard
ar15 platform--there are used AA uppers for sale reasonably
or u could try Model 1 upper for a hunting rifle--carries like
a slim lever action. I have 14" to 24" guns and have never wanted
more in the accuracy department or knockdown power--tried a match
grade ar10 but it just wasnt for me--only used at range for paper
punching. IMHO the Grendel round is a great compromise.
 
#14
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: AKA-Spook</div><div class="ubbcode-body">Getting ready to build 6.5 BRX and 30 BRX on ar-15 platform....both based on 6BR cartridge,necked up.
Will shoot 123 gr SMKs in the 6.5 and 155 Lapua in the 30.
I've built both cartridges on bolt actions already.
Both should romp on the PPC based cartridges listed with the downside of reduced capacity in mags.
1xs copy.jpg


pic of 20BRX(fantastic varmint round),6.5 and 30 BRX next to 6BR.
If these pan out the 338 Whisper is next. </div></div>
You're right apx 200fps faster than PPC/Grendel based cartridges and on the AR15 platform.
With a 6BRX I am getting about 3050 from 107s and 3150 from 95s and a 22" barrel.
6.5 BR I am getting 2840 with 123s and a 20" barrel.
10 rounds fit in a 15 round PRI 6.8 mag
 
#18
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Powder Burns</div><div class="ubbcode-body">Wonder how the 6.5BRX stacks against the Grendel. </div></div>

about 250fps faster maybe 300, 123 at 2840 from a 22" barrel, I think I can do better if I can find some more N530.
H.
 
#19
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mr06</div><div class="ubbcode-body">never heard of the 6 rat. I am mainly looking for whatever is good in a AR-15 platform. something with pretty good barrel life and effective out at around 800 yards.

how hard is it to get reamers? I have a smith in town that does all my work.

I am really liking the 6mmAR turbo though. maybe get my 6X45 reamed out to that??? </div></div>

No,you can't do that with an AR barrel,problem is that once it has been chambered and the barrel extension is installed,the gas port is drilled in the barrel.Trying to remove it,set it back,ream it and re-install so it works would be a real bitch.This was explained to me by a couple of great smiths.If you know a good smith,just get the barrel,have him chamber it, install the extension and drill the gas port.You might have to pay for a reamer.
 
#20
Re: 6mm and 6.5mm AR-15s.

The 6.5 BRX looks interesting, I am wondering what you are going to use for a bolt? The Grendel bolt is as open as you can get witout compromising the locking lugs. I guess you could use the 30 RAR bolt, carrier and barrel extension if they are available. You will have to keep us posted on this project. Good Luck
 
#21
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rasp65</div><div class="ubbcode-body">The 6.5 BRX looks interesting, I am wondering what you are going to use for a bolt? The Grendel bolt is as open as you can get witout compromising the locking lugs. I guess you could use the 30 RAR bolt, carrier and barrel extension if they are available. You will have to keep us posted on this project. Good Luck </div></div>

why I was looking at the 6mmAR turbo. uses a 6.5 grendel bolt. not sure if this is going to take year for me to do or not. what do I get for a barrel? just a blank from one of the companies out there? or do I need a special AR barrel?
 
#23
Re: 6mm and 6.5mm AR-15s.

I have a 6mm RAT built by Lee Wells which is the 6.5 Grendel necked to 6mm with the neck blown forward by 0.075 and the shoulders at 40 degrees. Top quality upper for about 2/3 the price that Whitley charges. I also have a 6mm WOA which is the 6.8 SPC necked to 6mm along with a 243 WSSM so one could say I sort of like 6mm AR15s
 
#24
Re: 6mm and 6.5mm AR-15s.

Something VERY similar to the 6mm AR can be had from Pacific Tool and Gauge. Its called the 6mm GR Auto. Reamer is about $138 or so. Email Dave Kiff at PY&G for latest pricing. You'll need a roughing reamer too.
 
#26
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Casey Simpson</div><div class="ubbcode-body">AR, tell us about the RAT and the WSSM? </div></div>
The wssm case necks are .034" thick, they normally do not swell to seal off the chamber. I made a 6.5 and 338 ARSM from wssms but the chambers are designed to use .014" turned necks to get better accuracy. The other thing is other than DTECH you have to buy a $800 upper to get a carrier, bolt and extension to use. You could use the Oly upper receiver but IMO it's hacked.
There are several versions of the Grendel necked down to 6mm, the 40 degree versions may be able to hit 2900fps from a 28" tube but the accuracy node where the pressures aren't so high is around 2800-2850fps from a 28" barrel. I have a 6mm Banshee that is close to the original 6mmAR, it shoots 90 lapuas and 95SMKs great around 2800 from a 22" barrel but just doesn't have the boiler room for the 107s IMO.
Make a good varmint cartridge for 80gr bullets and under.
Like one of the guys above said PTG has a 40 degree version, if it has a .270-.272 neck it's probably a good chamber.
 
#27
Re: 6mm and 6.5mm AR-15s.



<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Like one of the guys above said PTG has a 40 degree version, if it has a .270-.272 neck it's probably a good chamber.</div></div>
You want a neck at .274 unless you want to neck turn. The loaded round with Lapua brass is .270 for the 6Rat.
 
#28
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Krebaum</div><div class="ubbcode-body">

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Like one of the guys above said PTG has a 40 degree version, if it has a .270-.272 neck it's probably a good chamber.</div></div>
You want a neck at .274 unless you want to neck turn. The loaded round with Lapua brass is .270 for the 6Rat. </div></div>
Grendel necks are .0135 thick when necked down to 6mm? I run a .271 neck, same as my BRs and BRXs
 
#29
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bustin</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Krebaum</div><div class="ubbcode-body">

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Like one of the guys above said PTG has a 40 degree version, if it has a .270-.272 neck it's probably a good chamber.</div></div>
You want a neck at .274 unless you want to neck turn. The loaded round with Lapua brass is .270 for the 6Rat. </div></div>
Grendel necks are .0135 thick when necked down to 6mm? I run a .271 neck, same as my BRs and BRXs </div></div>

So you think it is a good idea to have .001 or less neck clearance in a gas gun? My neck measure .270-.271 with a loaded rnd and Lapua brass.

The experts will tell you, you need a minimum of .003 in a gas gun.
 
#30
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Krebaum</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bustin</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Krebaum</div><div class="ubbcode-body">

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Like one of the guys above said PTG has a 40 degree version, if it has a .270-.272 neck it's probably a good chamber.</div></div>
You want a neck at .274 unless you want to neck turn. The loaded round with Lapua brass is .270 for the 6Rat. </div></div>
Grendel necks are .0135 thick when necked down to 6mm? I run a .271 neck, same as my BRs and BRXs </div></div>

So you think it is a good idea to have .001 or less neck clearance in a gas gun? My neck measure .270-.271 with a loaded rnd and Lapua brass.

The experts will tell you, you need a minimum of .003 in a gas gun. </div></div>
I don't think my brass is as thick as yours and as long as my rifle shoots in the .3s I don't much care what the "experts" say. Dave Kiff and I got together on the reamer, it seems to work.
I have already done my 6mm on the grendel case experimenting 4 years ago and have moved on the the BR and BRX. easier to tune, more accurate and faster, just no reason for me to go back to the Grendel case.
 
#31
Re: 6mm and 6.5mm AR-15s.

I do agree, that a 6BRX or 6Dasher does have the ultimate performance for an AR-15 for Highpower. I just have not seen one that works reliably. I would like to see one of yours at sometime and try it out. If it works reliable, I would switch to one in a 6Dasher.
 
#33
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Krebaum</div><div class="ubbcode-body">I do agree, that a 6BRX or 6Dasher does have the ultimate performance for an AR-15 for Highpower. I just have not seen one that works reliably. I would like to see one of yours at sometime and try it out. If it works reliable, I would switch to one in a 6Dasher. </div></div>
There are close to 50 from the first batch being shot and we have probably sold another 20 from the second batch, we should start hearing some reports soon. I am not sure how a Dasher with a 40 degree shoulder will feed, I tried a 6.5-08AI in a AR10 that did not work so well but the 6 and 6.5, BR and BRX
feed fine and the 6 and 6.5 x47 are feeding fine in the AR12. Just like everything many are sitting back waiting on the guinea pigs to talk.
 
#34
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bustin</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Powder Burns</div><div class="ubbcode-body">Wonder how the 6.5BRX stacks against the Grendel. </div></div>

about 250fps faster maybe 300, 123 at 2840 from a 22" barrel, I think I can do better if I can find some more N530.
H.</div></div>

How's your brass life?
 
#35
Re: 6mm and 6.5mm AR-15s.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jthyttin</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bustin</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Powder Burns</div><div class="ubbcode-body">Wonder how the 6.5BRX stacks against the Grendel. </div></div>

about 250fps faster maybe 300, 123 at 2840 from a 22" barrel, I think I can do better if I can find some more N530.
H.</div></div>

How's your brass life? </div></div>
Haven't tossed any yet so don't know how long they will last, seems like I have 6 loads on the first 200 6.5BRs now. I have 8 loads on most of the 6BRXs(700), lost 2-3/100 when fireforming.
I still have some Grendel brass from 4 years ago, I can't read the headstamp on most of them but the cases are still together. I try to keep .002 setback in a precision AR to keep stretch to a min.
Lapua brass is tough but, I have had good luck with LC 5.56 too.
 
#36
Re: 6mm and 6.5mm AR-15s.

I was afraid primer pockets would give up soon with such velocities from such a small case. Haven't much experience with 308 bolthead and small primers, though...
 
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