5.56 1:6 twist barrel testers

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[ARCHIVED THREAD] - 5.56 1:6 twist barrel testers (Page 1 of 3)

Posted: 11/26/2014 12:37:55 PM EDT

Hi

A while back I was thinking that there may be some value in making a faster twist AR barrel. The idea is to have the ability to use heavier bullets out of shorter barrels, allowing for a CQB type rifle to perform at longer ranges as well as close, while using 70+ grain projectiles. I've started testing a bit but time has been limited. I thought there may be a few guys here that could see some potential for this and willing to put in some time experimenting. I've got a few 14.5" and 16" to do this project. While it's really intended for shorter barrels I made these up for basic ease of testing in non SBR configurations. You get the barrel free of course, I would just like honest feedback. There are only a few done so only sign up if you're serious about doing it. The barrels are chrome lined and phosphate. Just sign up here, I've got about ten barrels available. Just specify the length you want to test.

Thanks
Rick at Green Mountain.

Posted: 11/26/2014 1:28:49 PM EDT

[#1]

I'll test a 16 inch. I'll PM my info.

Posted: 11/26/2014 1:41:32 PM EDT

[#2]

I'll test a 14.5", so long as it's pinned (I don't have a SBR lower, yet).

What are you looking for? Accuracy and velocity eval? I can compare it to my 1:7 14.5" Colt barrel, if that helps. I've already got some chronograph results with 77gr Black Hills OTM (SMK) and TMK loads.

ETA: will you be supplying the gas block and gas tube as well?

Posted: 11/26/2014 1:42:34 PM EDT

[#3]

I have SBR's and can test shorter barrels.

Posted: 11/26/2014 1:47:54 PM EDT

[#4]

I can test a 16" barrel & compare with my 1/7 16"mid lenght. I have reloads & factor loads. I do load for 70+ LVD Bullets. IM me for details where the barrel can be shipped.

Thank you,
Stone76245

Posted: 11/26/2014 2:11:51 PM EDT

[#5]

Thanks for the replies.

Muad, I don't have any flash suppressors to pin on. That would have to be handled on your end.

Those interested can send me an email at [email protected]

As far as test results, accuracy with both light and heavy bullets would be appreciated.

Looking forward to results

Posted: 11/26/2014 2:16:28 PM EDT

[#6]

Email sent.

ETA: How short of one would you like tested? 7.5"? 6"? or more standard 10.5/11.5?

Posted: 11/26/2014 2:30:55 PM EDT

[#7]

Email sent. I have barrels of all twist 1:7, 1:8; 1:9 and a 1:12 that I can test these against. As well as several registered SBR lowers so I can test at any length you would like out to 300 yards.

Posted: 11/26/2014 2:33:08 PM EDT

[#8]

Quote History

Quoted:

Thanks for the replies.

Muad, I don't have any flash suppressors to pin on. That would have to be handled on your end.

Those interested can send me an email at [email protected]

As far as test results, accuracy with both light and heavy bullets would be appreciated.

Looking forward to results

View Quote

Fair enough.

Email sent. Thanks for the opportunity, and have a Happy Thanksgiving!

-Will

Posted: 11/26/2014 2:48:39 PM EDT

[#9]

Rick,

I can test one of the 14.5s that may be inconvenient for others needing to get them pinned if any are left. What kind of info were you looking for? Can I get some more specs on the barrel? Profile? Gas system length? Chrome lined? 5.56 or .223 chamber? Looking forward to hearing from you. Thanks.

Edit: Sorry, just read your first post. Will shoot you an email.

Posted: 11/26/2014 3:27:17 PM EDT

[#10]

I'd love to test this.

I have a 16" 1-7 and a 10" 1-7 to base against.

Also I have hand loads that are 70gr that are dead nuts accurate in my 1-7s. I'm curious as to any gain the 1-6 would have.

I was having this very conversation with a coworker over breakfast this morning.

Posted: 11/26/2014 4:22:02 PM EDT

[#11]

I'll test a 14.5. I have lots of 77smk loaded up.

Posted: 11/26/2014 5:54:13 PM EDT

[#12]

Thanks guys. I may have a couple left but can't say for sure until I get back in the shop Monday. Here's something I've been thinking about as well, a 20" set up as a long distance varmit rifle. That is, if there's some promise in this test.

Posted: 11/26/2014 6:05:26 PM EDT

[#13]

Quote History

Quoted:
Thanks guys. I may have a couple left but can't say for sure until I get back in the shop Monday. Here's something I've been thinking about as well, a 20" set up as a long distance varmit rifle. That is, if there's some promise in this test.

View Quote

I can't say for sure, but the really light varmint bullets like the 40 grain nosler varminter projectiles have performed poorly for me out of my 1:7 twist as opposed to my 1:9. However, those test have always been on 16" barrels. I would be curious to see if the 1:6 would be just too fast of a twist for them.

Posted: 11/26/2014 6:10:35 PM EDT

[#14]

I'd be interested in testing a 16" barrel if any more are available.

ETA: On second thought maybe a 14.5 would be preferred since they are really to test shorter lengths, I'd be happy to test either one though.

ETA 2: Email sent.

Posted: 11/26/2014 6:36:54 PM EDT

[#15]

You should get a 6.5 twist in a 20" length for the NRA & CMP High Power shooters that want to shoot 90gr bullets for 600 or 1000 yard shooting.

Not uncommon for active HP shooters to go through a barrel every year or every other year.

B

Posted: 11/26/2014 6:46:52 PM EDT

[#16]

Subed, and I hope to see a 12.5" test.

Posted: 11/26/2014 7:02:29 PM EDT

[#17]

Email sent. sbr - 20" avail here.

Posted: 11/26/2014 7:08:58 PM EDT

[#18]

Quote History

Quoted:

I can't say for sure, but the really light varmint bullets like the 40 grain nosler varminter projectiles have performed poorly for me out of my 1:7 twist as opposed to my 1:9. However, those test have always been on 16" barrels. I would be curious to see if the 1:6 would be just too fast of a twist for them.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
Thanks guys. I may have a couple left but can't say for sure until I get back in the shop Monday. Here's something I've been thinking about as well, a 20" set up as a long distance varmit rifle. That is, if there's some promise in this test.

I can't say for sure, but the really light varmint bullets like the 40 grain nosler varminter projectiles have performed poorly for me out of my 1:7 twist as opposed to my 1:9. However, those test have always been on 16" barrels. I would be curious to see if the 1:6 would be just too fast of a twist for them.

Yes I was thinking heavy bullets for real long range use.

Posted: 11/26/2014 7:13:55 PM EDT

[#19]

Hey guys, I've had way more response than I thought so please bear with me if I don't respond to IM's real quick. Like I noted I'm not sure what I have left but will let you know Monday. I really appreciate the responce. Hope all will have fun with this.
Thanks
Rick

Posted: 11/26/2014 7:21:13 PM EDT

[#20]

Email sent.

Interested in 7.5" or 10.5" barrels or 20" barrel. I ran a 500 round cast bullet test through a 1:12 barrel (results are posted here in the archive), and it would be interesting to see what would happen with a 1:6 twist

Posted: 11/26/2014 7:29:28 PM EDT

[#21]

For heavy it could be promising. For the 90 grain the Sierra and a few others make, most seem to be using 6.5, but i think that is only because 1:6 isn't available. I guess the only concern would be at around 325,000-350,000 spin rate the projectiles may spin apart. Out of a 20" barrel, the spin rate should still be under 275,000 so unless someone really pushes the velocity I can't see it being a problem.

Posted: 11/26/2014 7:55:26 PM EDT

[#22]

email sent!

MRW

Posted: 11/26/2014 8:28:41 PM EDT

[#23]

tag for results

Posted: 11/27/2014 2:07:00 PM EDT

[#24]

I'd be willing to test whatever length (SBR to 20"). I've actually been wanting to do something like this for 600+ yard shooting with 80/90VLDs.

I'll be hitting the 1000 yard range late December/early January and typically use 77g out to 600 with no problems.

Curious what bullet weight/type you're looking for results with?

Posted: 11/27/2014 4:32:21 PM EDT

[#25]

Quote History

Quoted:

Thanks guys. I may have a couple left but can't say for sure until I get back in the shop Monday. Here's something I've been thinking about as well, a 20" set up as a long distance varmit rifle. That is, if there's some promise in this test.

View Quote

If you get any 18" or 20" barrels made up, I'd test one of those too. BH 77gr TMKs and this could be a nice combo for some long range prairie dog smoking.

Posted: 11/27/2014 4:37:04 PM EDT

[#26]

I'd love to test one of the barrels set up for CMP/NRA matches.

Posted: 11/27/2014 8:30:52 PM EDT

[#27]

Hi all. Just got back from Turkey day at the folks house. A certain Mr. Jim Beam is helping me wash the libtard away. Be back Monday when I get back in the shop and see what I have left. Cheers, Rick

Posted: 11/27/2014 8:35:35 PM EDT

[#28]

I can cold weather test for you

SBR would be great

Posted: 11/27/2014 8:37:49 PM EDT

[#29]

Where abouts in AK are you?

Posted: 11/27/2014 8:39:37 PM EDT

[#30]

Anchorage

Posted: 11/27/2014 8:45:04 PM EDT

[#31]

I had an apartment in Anchortown for a bit back in 85. Lived in Sitka and Kodiak for about 7 years or so. Spent a bit of time in Cordova and Yakutat back then as well I hope to go back and visit one day.

Posted: 11/27/2014 8:50:06 PM EDT

[#32]

Right on. Yeah, a lot has changed here in town, for sure!

Posted: 11/28/2014 7:23:47 PM EDT

[#33]

I go to the range quite often and have a couple sbr's and stripped uppers laying around. I can test whatever length you would like just let me know. Thanks

Posted: 11/28/2014 9:33:27 PM EDT

[#34]

Interested in results, I've read 1/6 is for 80's and above.

Posted: 12/1/2014 11:21:33 AM EDT

[#35]

OK, sorted through the emails and IM's. Looks like I'll have enough barrels for all that want to join in. I didn't get screen names for all and still short a couple addresses. Here's a list so please check that you're here as you may have sent your address but I didn't match it up to a screen name:

Stone76245 16"
Scorch05 16" (need address)
MRW 16"
AR180 16"
phylodog 12.5"
greyghost 16"
Twitchy 16"
Skillshot 16"
brdvictim 16"
Sputnik556 16"
MUAD 14.5"
Jaqufrost 14.5"
NAVYiS2 14.5"
WE-06 12.5"
Hatr40 16"
556hunter 14.5"
epointer 16"
223REM 16"
milspec556 16"
grasshog 16"
silentmark 16"

I may have the address but missed the tie in to the screen name. Please email the address with your screen name to me at [email protected]

The barrels are in QC and should start shipping out tomorrow. To those that asked, these are basic barrels with no gas blocks installed.

I'll be making up some more in the next few weeks, thinking 10.5" and 20".

Thanks for joining in!

Rick
Update: Most all barrels have been shipped, couple more to go out today. 12/8

Posted: 12/2/2014 4:35:55 AM EDT

[#36]

Depending on if you are willing to wait for my Efiled F1 to come back, I'd be interested in a 7"... It may be a few months before I can do some serious testing... DOn't want to freeload so you can say yes or no if the wait is too long. But I would love to try a 7" or even a 6.5" for giggles

Posted: 12/2/2014 9:05:12 AM EDT

[#37]

The shortest I'm going for right now is 10.5". We'll see if there's enough potential to invest in making pistol barrels.

Posted: 12/2/2014 10:10:54 AM EDT

[#38]

IM sent. Thank you guys for being willing to test out new waters.

Posted: 12/2/2014 10:35:49 AM EDT

[#39]

Maybe I missed it, but what profile are these going to be?

I have plenty of 75 and 77 gr. stuff to shoot, but what do you guys think will happen in something like a M855? Just curious more than anything.

Posted: 12/3/2014 11:29:56 PM EDT

[#40]

I didn't see anyone who piped up for a 10.5". I'd be happy to try one out. I shoot 77gr SMKS and some 75gr Hornady cannelured bullets.

Posted: 12/3/2014 11:34:55 PM EDT

[#41]

Really looking forward to seeing this barrel. I've got parts inbound to finish out an upper and I've got a bunch of bullets that just showed up for testing.

Posted: 12/3/2014 11:35:01 PM EDT

[#42]

I'll test a 10ish inch on my SBR. I could test a shorter one too I suppose, if I can find that short rail I bought.

Posted: 12/3/2014 11:50:36 PM EDT

[#43]

Just IM'd you.

For those that reload, we could do a thread in the reloading section to discuss loads as well. I don't have anything over 77gr right now hat I have loaded.

I'm not worried about the barrel stabilizing heavy loads, but mag length is going to be the kicker when trying to go over these. The 80ish grain bullets will be a better load probably. There are the 90gr VLD and SMK, but I think they stopped making production 100gr bullets to even try. It might, however, help with better stabilizing the higher grain all copper bullets.

Posted: 12/4/2014 1:09:59 AM EDT

[#44]

I'd be in for an 10.5 or shorter SBR length barrel, I'd just need a little notice to build up the whole upper, I have the tools and knowledge, just no vise ( I just told Santa I'm buying a workbench or else). I'm willing to share specs and pics of my current SBR set up, it's also suppressed for further data. I have approx 10 variations of 5.56 & .223 factory ammo. I can buy a chrono anytime with a trip to Cabela's.

ETA: If you have enough 10.5"ers, I'd love to be in the loop how they perform, for future purchase sake.

Posted: 12/4/2014 3:13:48 AM EDT

[#45]

Darn, I was hoping for something that'll stabilize heavier shit in a PDW style build. If you decide to make a 7", or even if you want me to cut one to 7" myself, I'd love to give it a whirl.

Posted: 12/4/2014 3:17:36 AM EDT

[#46]

I would test whatever. A 11.5" would be perfect to compare to my DD CHF 11.5" though.

If you search for InfiniteGrim on here I've done lots of testing, with lots of documentation

I'm more interested in accurracy, not sure if gel tests would be in order or not... I've got reloading equipment, a SBR lower, and a suppressor for tests...

Posted: 12/4/2014 8:38:03 AM EDT

[#47]

I doubt you have any left, but if you do I could test what ever length you would like tested. IM sent

Posted: 12/4/2014 10:44:23 AM EDT

[#48]

Good morning all,

I've answered the IM's and pretty much just need addresses. The only thing I have left is a couple 14.5 and 16". The 10.5" wont be done until after New Years. Getting the chrome and phosphate done takes a while. As noted earlier I felt that this twist would really shine in short barrels giving better stability for much heavier bullets at both short (CQB) and longer 1-200 yard range if the need arose to switch quickly from one scenario to the other. Later I thought that long range shooters might benefit from the twist as well so I will make up some in 18 or 20" length later on. Even if nothing of value comes from the testing it will answer the question nagging me about this twist rate. I appreciate everyone being willing to participate.

Thanks
Rick

Posted: 12/4/2014 10:50:32 AM EDT

[#49]

How about a 26" barrel to shoot thin-skinned 32 grain pills out of? It'll turn your AR into a shotgun!

Posted: 12/4/2014 11:20:53 AM EDT

[#50]

I'd be down to test one of the 10.5" barrels on my sbr or one of the 20" barrels when you get them, I am a reloader and currently have bullets in 40, 55, 68, 69, 77, 80, and 90 grains.

[ARCHIVED THREAD] - 5.56 1:6 twist barrel testers (Page 1 of 3)

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