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post #1 of 15 (permalink) Old 08-20-2009, 01:44 PM Thread Starter
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AR 15 barrell Twist

What twist would you reccomend in 223 for 75 Grn Bullet?

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post #2 of 15 (permalink) Old 08-20-2009, 01:49 PM
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1/7
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post #3 of 15 (permalink) Old 08-20-2009, 05:58 PM
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1/8 or 1/7, if 75 is as heavy as you plan to go, a 1/8 is more realistic.
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post #4 of 15 (permalink) Old 08-20-2009, 06:00 PM
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Originally Posted by 5.0_CJ View Post
1/8 or 1/7, if 75 is as heavy as you plan to go, a 1/8 is more realistic.
I assumed he is asking about a 16 - 20 inch barrel. I didnt think that the 16" barrel was sold with the 1/8 twist.
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post #5 of 15 (permalink) Old 08-20-2009, 06:11 PM
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Originally Posted by Pokulski-Blatz View Post
I assumed he is asking about a 16 - 20 inch barrel. I didnt think that the 16" barrel was sold with the 1/8 twist.
They do make them, les baer and J&T have 16" 1/8's.
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post #6 of 15 (permalink) Old 08-20-2009, 06:12 PM
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They do make them, les baer and J&T have 16" 1/8's.


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post #7 of 15 (permalink) Old 08-20-2009, 06:18 PM
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Originally Posted by Pokulski-Blatz View Post


It's a newer twist coming up, I'm seeing it more and more often. I decided to go with a 1/8 on my 24" because it allows me to shoot standard 55gr all the way to 90gr VLD's because of the length, on a 20" a 1/8twist would probably not stabilize a 90gr. So far I've been pretty happy. Anyone have a 1/7 16"? How does it shoot 55gr?
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post #8 of 15 (permalink) Old 08-20-2009, 06:38 PM
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Quote:
Originally Posted by 5.0_CJ View Post
It's a newer twist coming up, I'm seeing it more and more often. I decided to go with a 1/8 on my 24" because it allows me to shoot standard 55gr all the way to 90gr VLD's because of the length, on a 20" a 1/8twist would probably not stabilize a 90gr. So far I've been pretty happy. Anyone have a 1/7 16"? How does it shoot 55gr?
1/7 @ 16" is the M4 profile, isn't it?

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post #9 of 15 (permalink) Old 08-20-2009, 06:43 PM
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Quote:
Originally Posted by 5.0_CJ View Post
It's a newer twist coming up, I'm seeing it more and more often. I decided to go with a 1/8 on my 24" because it allows me to shoot standard 55gr all the way to 90gr VLD's because of the length, on a 20" a 1/8twist would probably not stabilize a 90gr. So far I've been pretty happy. Anyone have a 1/7 16"? How does it shoot 55gr?
The military seems to do ok with a 14.5" 1/7 twist barrel and 55 grain ammo
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post #10 of 15 (permalink) Old 08-20-2009, 08:49 PM
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1/7 @ 16" is the M4 profile, isn't it?
yes it is. I'm assuming they use the extra twist to stabilize the heavier rounds in such a short barrel. Probably the reason why a 1/7 with a 20 or 24" barrel is overkill, and 1/8 is becoming popular. I've never shot a 1/7 16" barrel with heavy rounds, I wonder how it does.
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post #11 of 15 (permalink) Old 08-21-2009, 09:08 AM Thread Starter
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Thanks to all. My co-worker was wanting to know, he's purchasing an AR 15 next week.

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post #12 of 15 (permalink) Old 08-21-2009, 11:19 PM
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I shoot 75gr Hornady BTHP, 73gr Bergers, and 69gr SMK out of my 1:9 twist.

I could also run the 77gr SMK.

I won't touch the 75gr A-Max, 80-90gr SMK or 80-90gr Bergers with anything over 1:8.

It's just not the twist, you have to be able to fit the bullet.

69gr SMK can be loaded to mag length. I also run the 75gr H-BTHP at magazine length. The A-Max and 80gr and up bullets are not for magazine length.

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Last edited by GT98SVO; 08-21-2009 at 11:21 PM. Reason: mag length
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post #13 of 15 (permalink) Old 08-22-2009, 02:02 AM
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I shoot 75gr Hornady BTHP, 73gr Bergers, and 69gr SMK out of my 1:9 twist.

I could also run the 77gr SMK.

I won't touch the 75gr A-Max, 80-90gr SMK or 80-90gr Bergers with anything over 1:8.

It's just not the twist, you have to be able to fit the bullet.

69gr SMK can be loaded to mag length. I also run the 75gr H-BTHP at magazine length. The A-Max and 80gr and up bullets are not for magazine length.
Yes, but you're shooting out of a 20" bull barrel though, aren't you?
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post #14 of 15 (permalink) Old 08-22-2009, 02:54 AM
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Yes, but you're shooting out of a 20" bull barrel though, aren't you?
Yea, 20in bull.

I hit .640in 5shot group with 55gr NBT at 100 yards.
I did .688 10shot group with same. Both days were over 100 degree temps.

Have a bunch more, but no time to shoot.

1:8 should work great for most bullets, even better than 1:9. Seen 40gr in tight group with 1:8 bolt action. Albeit, a 5k Sisk rifle made in Dayton, TX.

Hart barrels has a pre-fit AR barrel in whatever you want(length, twist, contour) for 640$. Includes gas tube. They fit it to your bolt.

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post #15 of 15 (permalink) Old 08-22-2009, 03:43 AM
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Also, you going to need a 5.56 match chamber or Wylde chamber for the big bullets.

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