twist question

[Little gator]

So I know in 16"-20" barrels (.223) you need 1:8 at least for higher gr. bullet 1:7 is (IMHO) better. I use 1:7 20" with 75 gr at the moment. Oh by the way this is an AR

I'm just now wanting to reach out well past 400 so I'm pretty sure I want to jump up to a 24"-26" and I know jack all about that range and barrel size.... So my question is with a a longer barrel do I need to keep the 1:7twist Or will that spin em too fast? like I said I know jack all about this and could really use a hand.

Thanks a bunch

 

[ORD]

Pick one and be done.

A 1:7 barrel will work fine as long as you are running ONLY the heavier pills, but it may be too much if you would happen to want to run some of the considerably lighter vermin bullets from the same rifle. A 1:8 for any mag-length loaded pills you want to run will work very well (including those in the 68-69gr, 75gr, and 77gr class just to name a few). Where the faster, 1:7 twist will shine over the 1:8 is when you get into shooting the longer, heavier pills that won't seat to mag lengths (such as the 80gr SMK and heavier class bullets) that are most commonly used for 600yds and out with a .223/5.56 AR.

As for barrel length...that's your call. While a 20" barrel will certainly get the job done at extended ranges with the AR (it'll certainly get you to 600yds), if ease of portability/weight/etc. aren't a big concern for you with your particular setup, then I'd opt for a longer barrel every time and not think twice about it as it will give you an advantage for really reaching out with your AR to the max of its potential.

 

[FCS]

So I know in 16"-20" barrels (.223) you need 1:8 at least for higher gr. bullet 1:7 is (IMHO) better. I use 1:7 20" with 75 gr at the moment. Oh by the way this is an AR

I'm just now wanting to reach out well past 400 so I'm pretty sure I want to jump up to a 24"-26" and I know jack all about that range and barrel size.... So my question is with a a longer barrel do I need to keep the 1:7twist Or will that spin em too fast? like I said I know jack all about this and could really use a hand.

Thanks a bunch

I've ran 55 FMJs in a 7 twist Colt barrel, shot just fine. 55 varmint bullets with thinner jackets when pushed hard would occasionally self destruct about 50-60 yards out.
7, 7.7 or 8 twist will do just fine. You are not gaining enough extra velocity to over spin bullet.
No issues keeping rounds on a half size IPSC target @ 650 yards with a 16" bbl'ed AR. If you do go 22" or longer bbl, I'd go with +2" gas system as well.

 

[Little gator]

Pick one and be done.

A 1:7 barrel will work fine as long as you are running ONLY the heavier pills, but it may be too much if you would happen to want to run some of the considerably lighter vermin bullets from the same rifle. A 1:8 for any mag-length loaded pills you want to run will work very well (including those in the 68-69gr, 75gr, and 77gr class just to name a few). Where the faster, 1:7 twist will shine over the 1:8 is when you get into shooting the longer, heavier pills that won't seat to mag lengths (such as the 80gr SMK and heavier class bullets) that are most commonly used for 600yds and out with a .223/5.56 AR.

As for barrel length...that's your call. While a 20" barrel will certainly get the job done at extended ranges with the AR (it'll certainly get you to 600yds), if ease of portability/weight/etc. aren't a big concern for you with your particular setup, then I'd opt for a longer barrel every time and not think twice about it as it will give you an advantage for really reaching out with your AR to the max of its potential.

Oh there's no way I'm sending a 55gr 600 yards. Il be sticking with 75 + gr

I was thinking about getting a shillen 24"(they have the shortest lead time)but the only twist they have for the 24 is1:12 kriger has a 26 with 1:7 any impute on which? Weight is a non issue +1 for slings.

Thanks a bunch guys.

 

[ORD]

Oh there's no way I'm sending a 55gr 600 yards. Il be sticking with 75 + gr

I was thinking about getting a shillen 24"(they have the shortest lead time)but the only twist they have for the 24 is1:12 kriger has a 26 with 1:7 any impute on which? Weight is a non issue +1 for slings.

Thanks a bunch guys.

PM on the way shortly with a possible source for a couple barrel options for you to consider!!

 

[SWThomas]

Call Compass Lake. I just got a 24" Douglas 1:7 heavy barrel. Took about two weeks to get it. They also have Kreiger and Bartlein blanks. But they're considerably more expensive.

 

[JJones75]

I've been running the new 53g Super Performance ammo from Hornady out of a 1/7 twist Noveske with no issues at all and its actually more accurate at 200yds than the 75g TAP ammo. Granted this is a 10.5" barrel so some speed is lost but I've never had a bullet blow up.
My dad shoots the 40g V-max ammo out of a 22" 1/8 twist Hart barrel with no issues so I don't think their will be a problem blowing up bullets due to speed or RPM.

 

[CK_32]

Pick one and be done.

This^^


I run 1:7 and have no issues spitting 55gr projectiles. I know people who run a 1:9 and have no issues shooting 75gr's.


It's more spec sheet mumbo forum guys throw around like gospel like everything else.

 

[Shooter_Mc_Gavin]

Don't read into the red circled part someone wanted to know something out of a book I had and I just took a scan and circled in paint.

 

[TravisP]

I have 2 rifles with 1/8 twist one with 1/7 twist. Not a competition shooter just a hunter and a plinker. The 1/7 is on a 16 inch lightweight barrel and run an aimpoint on it, cant tell much difference with accuracy with any grain bullet. It has a 5.56 chamber. Its home defense and close in hunting. The 2 1-8 twist rifles 223 wylde chambers. One a 16 inch and the other an 18 inch. The 16 inch has an aimpoint on it so its pretty much set up for the same purpose as the 1/7. The 18 inch has a 3x9 burris on it and i use it for my longer range coyote/predator/paper rifle. I shoot 75 grain hornady match out of it and it shoots 5 shot quarter size groups all day. I have more more than 2 ar shooters in my house. From past experience i do believe that. 223 wylde chamber is more accurate than 5.55 and 223. Just my opinion though.

Sent from my Motorola Electrify using Tapatalk 2

 

[Little gator]

Thanks for the feed back.But I don't think I was clear with what I was asking.

I wanted to know if a longer barrel mean I could/should use a slower twist for the 75+ bullets.

Looking back I asked that completely wrong.

 

[ORD]

Thanks for the feed back.But I don't think I was clear with what I was asking.

I wanted to know if a longer barrel meant I could/should use a slower twist for the 75+ bullets.

Looking back I asked that completely wrong.

No...under average conditions, etc., you'll still need a minimum of a 1:8 twist regardless of how long you go with your barrel to properly stabilize most bullets in and around that weight range (75gr or heavier). You'll occasionally find people who'll swear that a 1:9 will get the job done with ~75gr pills and while that may be true at least for them, it is generally not ideal and your accuracy/performance may suffer in the long run. Really, a 1:8 twist is just about ideal for most all commercially available, mag-length ammo for an AR, including bullets in the weight range you are wanting, as well as slightly heavier and a whole bunch that are a good deal lighter too.