What does 1 9 twist mean

A twist rate of means that the bullet does one degree rotation per 12 inches of barrel. A twist rate indicates that the bullet will undergo a rotation once every seven inches, which, as you might imagine, is a much faster spin.

There are a wide variety of bullet weights available, anywhere between 30 and 80 grains, in the extremes of the 5. Want to shoot a little lighter?

Go Little heavier? How many people buying an AR ask specifically what the barrel twist is? I have 2 friends with an AR, and if I asked them, I doubt they would know. If I asked them which has a tighter twist,. My assumption would be is cheaper, and the average joe doesn't care. When you have a premium barrel such as Noveske, BCM, WOA, these are shooters to understand what twist is, think about what they will shoot, and are willing to pay extra for what they want, so is not as common.

Quoted: Please forgive me if this seems like an obvious answer, but I don't see it. Quoted: Quoted: Please forgive me if this seems like an obvious answer, but I don't see it. The highest-end barrel I own, a 26" 5. I don't need 77 grain for the work I do. Just figured I'd contriubte somehow to this post.

Also note that, for what it's worth, tightly twisted barrels will shoot-out quicker than say a or definitely a Quoted: Quoted: Quoted: Please forgive me if this seems like an obvious answer, but I don't see it. Quoted: Quoted: There is so much fail in that article. Quoted: is not actually , I believe it's Quoted: Quoted: Quoted: There is so much fail in that article.

As the gentelman from Armalite said Cant believe nobody referenced the ammo oracle yet. Quoted: Quoted: is not actually , I believe it's Quoted: You only want just enough twist to stabilize the bullets you are using. I've heard there is no such thing as 'over stabilizing' a round. I read somewhere that its a myth. I am not aware of any record that rounds can actually fly apart in mid-flight because they are spinning too fast.

I would take a over my any day. How are the twist barrels for accuracy? BCM has an ion-bonded stainless 16" midlength recon profile barrel I have been eyeing as a replacement for my CMMG recon barrel. The BCM looks dead sexy. Again, I am just wondering about accuracy. Not trying to derail the thread, but it does seem most barrels are either or with the majority of higher end barrels being The threw me for a loop.

I went all out with the Krieger barrel. That barrel is the cat's meow for shooting the really heavy bullets out to yards. A LOT of guys on the board want whatever the military uses regardless of the real world issues. Somewhat of a GI Joe complex. It will do fine up to 75 grains. In the real world just how many of us actually shoot 75 grains or heaver? Even if you do, how often?

They are quite expensive bullets. My opinion whatever that is worth , is that it comes down to the purpose of the weapon. If you are building or purchasing a weapon system for competitive long distance shooting then a 7" twist is great for those heavy, long distance, precision oriented rounds.

I have weapons with both rates. My personal defensive round is 75g. Both get about the same group sizes but in a real world scenario you wouldn't be picking shots off sitting at a bench. In a high adrenaline situation both will deliver rounds on target at a reasonable distance.

So, take it at what it's worth Then again, I dont build a rifle that I wouldn't trust my life with. Well then this just makes me wonder why even go to the expense of a barrel with. Why not upgrade to an AR10 that can shoot gr bullets?

Quoted: Well then this just makes me wonder why even go to the expense of a barrel with. The answer to the op is fairly simple Quoted: Quoted: You only want just enough twist to stabilize the bullets you are using. Quoted: Quoted: Well then this just makes me wonder why even go to the expense of a barrel with.

Quoted: The answer to the op is fairly simple Quoted: I've heard there is no such thing as 'over stabilizing' a round. Quoted: As the gentelman from Armalite said It's an interesting story.

In the early days of the M16A2 he received a message that Procurement was set to buy , M16A1 barrels just when the Army was switching to inch M16A2 barrels But one of his first actions at ArmaLite was to standardize the flexible inch rate. I thought these circle jerks were done with. I understand that if you primarily use varmint loads, a.

That's fine, and I dig that. However, if you use 55 gr and larger, for the life of me, I cannot understand why you wouldn't use Molon has demonstrated repeatedly, using different loads, the accuracy of the barrels.

Doubletap's grain Nosler Ballistic Tip load generates 3, feet per second of velocity out of a inch barrel, and will easily stabilize in this twist rate. My first centerfire rifle was a Ruger Mini with a 1-in twist.

If you're happy with and grain FMJ bullets, you don't need any more twist than this. In my mind, however, the 1-in twist is just a bit too restrictive. This is the beginning of the road for the shooter wanting to take advantage of the heavy bullet trend.

The 1-in-9 is a great compromise twist rate—not too fast to cause problems with the grain bullets, but fast enough to stabilize all but the heaviest bullets under most circumstances. This twist will stabilize most traditional bullets up to 75 grains, and monolithics up to 70 grains — but they do so right at the edge of the envelope so not all rifles will do it. With longer barrels and commensurate faster velocities, this twist can be more forgiving. For a inch general-use carbine, the 1-in-8 twist is about as versatile as it gets.

This twist rate will comfortably stabilize bullets up to grains, and the excellent and grain bullets also work great at a wider spectrum of velocities — which means barrel length isn't critical. My 3-gun rifle, built by my friend Iain Harrison , wears an inch, 1-in-8 twist White Oak Armament barrel and shoots just about anything well. This is the twist chosen by the military since the switch was made to the M16A2 — and the grain M cartridge — in the s. Its ability to stabilize tracer rounds in-flight is one of the reasons that the military chose this twist rate.

This barrel will stabilize bullets of up to 90 grains, and can handle the to grain bullets at just about any velocity, which makes it well suited for carbines with very short barrels. If you want a Mil-Spec clone, the 1-in-7 twist is the way to go.

I currently own two ARs with 1-in-7 twist rates — a To illustrate how velocity and twist rates can be the ying and the yang of bullet stability and accuracy, I fired a variety of loads side-by-side from the two rifles. The Matching the rifling twist in your rifle or carbine to the appropriate ammunition won't guarantee great accuracy, but it will ensure the bullet is properly stabilized in flight. On the other hand, using a bullet that's too heavy for your barrel's twist is a virtual promise of poor accuracy and ineffective terminal performance.

If you're struggling with the accuracy of your modern sporting rifle, be sure you've properly matched your ammunition to the barrel's twist.

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