AR-10 Bullet & Twist Rate: 100 - 600 Yards

P

Phil3

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Full Member
Minuteman
Dec 13, 2008
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San Ramon, CA
#1
I am ordering an AR-10 308 barrel 22" - 24" long from Krieger. I intend to shoot mostly at 100 yards, sometimes at 300, and rarely at 600, much less 800. I am thinking Sierra Match Kings in 168 grain. Krieger recommended a a 1:12" twist. 168 SMK good for my shooting distances, and is 1:12 a good twist rate for that bullet in an AR-10?

- Phil
 
#2
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

Krieger is one of the premier barrel manufacturers, if they say it's good to go, why would you ask a bunch of random people on the Internet the same question?

ETA: What kind of shooting are you going to be doing at 100 yards? Just punching paper? What about the longer distances?
 
#3
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Oodin</div><div class="ubbcode-body">Krieger is one of the premier barrel manufacturers, if they say it's good to go, why would you ask a bunch of random people on the Internet the same question?

ETA: What kind of shooting are you going to be doing at 100 yards? Just punching paper? What about the longer distances? </div></div>
 
#4
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Krieger is one of the premier barrel manufacturers, if they say it's good to go, why would you ask a bunch of random people on the Internet the same question?</div></div>

Because the people here appear to be well informed and may have real world experience with an AR-10 using the bullet I stated.

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">ETA: What kind of shooting are you going to be doing at 100 yards? Just punching paper? What about the longer distances?</div></div>

Paper punching only at all ranges. Maybe some shooting at metal gongs at longer ranges only.

- Phil
 
#5
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

You're obviously welcome to do what you want, but despite what Krieger says, I wouldn't go longer than a 20" barrel, 1 in 10 twist, and 155 scenars or 175 SMKs. If you're not going out to 1k yards, you don't need a barrel longer than 20".
 
#8
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

Fair enough. I think I would have to agree with the above advice about barrel length, and would say that you could even stick just go with 16", but if all you're doing is shooting from a bench the added portability is not important.
 
#9
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

I don't think Krieger will do shorter than a 20'' from their factory (jerks!)

I have a 22'' 1-12 from krieger, it shoots 155s, 168s, 17*, and 208 amax's from 100 to over 1100 yards.

With a gas .308 I am with lowlight, a 16 to 18'' 1in10twist barrel will get you as far as you should really be going with a .308 and remain effective.

not to mention holy crap my 22'' krieger is heavy, like uncomfortable to shoot unsupported standing.
 
#10
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

I also have a 22" Krieger barrel on my AR15, which is even thicker in diameter than their AR10. Yep, makes the gun heavy. My AR15 weighs 12.8 pounds without ammo and the light A2 stock and bipod. That's OK, it is just a bench gun.

Looking at http://www.6mmbr.com/308Win.html, it appears the 308 picks up 25 fps or so, for every 1" in barrel length. Not a big deal for the distances I am shooting, but may opt for a 20" or 22" just because I like the look better than a shorter barrel. And the extra velocity won't hurt.

- Phil
 
#11
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: hopps</div><div class="ubbcode-body">I don't think Krieger will do shorter than a 20'' from their factory (jerks!)

I have a 22'' 1-12 from krieger, it shoots 155s, 168s, 17*, and 208 amax's from 100 to over 1100 yards.

<span style="color: #FF0000">With a gas .308 I am with lowlight, a 16 to 18'' 1in10twist barrel will get you as far as you should really be going with a .308 and remain effective. </span>not to mention holy crap my 22'' krieger is heavy, like uncomfortable to shoot unsupported standing. </div></div>



what is the effective range for this barrel you speak of ?????
 
#14
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

I have a Krieger AR10 barrel on order for what it is worth. I am looking to build a M110 style rifle legal for service rifle competition. We shoot out to 600 yds.

I went with 20" 1 in 10.

Good luck.
 
#15
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: brasscow</div><div class="ubbcode-body">I have a Krieger AR10 barrel on order for what it is worth. I am looking to build a M110 style rifle legal for service rifle competition. We shoot out to 600 yds.

I went with 20" 1 in 10.

Good luck. </div></div>

Same here but i went with 22 1/2". I got the lighter weight profile too .812 diameter. thats not really "lighter" weight but I'm sure it will save upwards of a 1.lb on weight
 
#16
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

For a 168 grain bullet, either twist will rate will work fine. 168 is kind of a breaking point though. If you plan on ever shooting lighter bullets, the 1:12 will work best, but if you plan on ever shooting heavier bullets, a 1:10 would be better.
 
#17
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

LMT is selling their 308 in two different barrel/twist configs. both currently 16". Steel Chrome lined 1:10 twist, Stainless ultramatch in 1:11.25. I'm currently looking at this platform and shooting 168 and heavier out to 600ish. I was leaning towards the stainless barrel but am wondering if the 11.25 twist is approptiate? thanks.

Jeff
 
#18
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: redfisher</div><div class="ubbcode-body">LMT is selling their 308 in two different barrel/twist configs. both currently 16". Steel Chrome lined 1:10 twist, Stainless ultramatch in 1:11.25. I'm currently looking at this platform and shooting 168 and heavier out to 600ish. I was leaning towards the stainless barrel but am wondering if the 11.25 twist is approptiate? thanks.

Jeff </div></div>

the 1:11.25 is generally conidered to shoot everything up to 180g no problem in basically all conditions.

The 1:10 is recommended for heavier bullets because of the concern that a slower twist rate may not stabilize them in <span style="text-decoration: underline">all</span> conditions.

Myself and others shoot 208grain Amax bullets in 1-12 twist rifles, from sea level up to 5000ft asl and from 100 to over 1100 yards. But you are talking about a very small sample size of people on this forum.

Also, the stability factor for the 1:12/208 combo is something like 1.05, you might have to read bryan litz's book to understand but he basically says a factor above 1 should be stable, but a 1.30 stability factor is desirable just to make sure it will function in all conditions.

tldr: 1:10 will work from 1-600 with any weight bullet in any condition, 1:11.25 should work from 1-600 with everything up to the 200-210s, but will definetly work with 180 or less...
 
#19
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

If 168's and under 800 are your goal then I would stick with a short barrel 1:12.

However now that I have a couple hundred down the tube my 1:10 Noveske seems to do 168gr Gold Metal Match just fine.

Anecdotally my 1:12 700 will shoot everything from 155 Scenars to 178 Amax. I am getting ready to work up the 208 Amaxes for some long range, but as others have posted it should be fine.

The .308 will do just fine out of a short barrel at the ranges you are talking about. I would DEFINITELY not go longer than a 20" if you don't intend to venture past 800 yards. My 20" Noveske is a pig to lug about, but I built it with a little different intent in mind.
 
#20
Re: AR-10 Bullet & Twist Rate: 100 - 600 Yards

ubbthreads.php


ar-10t with kreger 1-10 24" barrel and here is a 7 rd shot group using 168`s at 100yds

ubbthreads.php
 
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