1.7 vs 1.9 barrel twist - Search
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  2. If shooting ammo on the heavy end of the spectrum (over 70 grains), a 1:7 twist rate is ideal. However, if shooting lighter ammo (50 grains or less), a 1:9 twist rate will suffice. On the other hand, you have experts who say that bullet length determines twist rate more than weight.
    www.ballisticadvantage.com/blog/ar-15-barrel-twis…
    1:9 will stabilize up to approx. 69gr (some will do slightly heavier bullets, but YMMV) and will also work on lighter 40-45gr bullets. It is plenty for shooting 55gr ball ammo. 1:7 will stabilize just about any heavier bullet, including 75gr, 77gr, and even 80gr bullets, but is generally not as effective with the lighter offerings.
    www.snipershide.com/shooting/threads/1-7-or-1-9-t…
    A 1/9 twist barrel will shoot a broad range of ammo just like 1/7 will. Only difference is a 1/9 will shoot from light to medium weight bullets best, and the 1/7 will usually prefer the medium to heavier weight bullets (I think it's actually a little more dependent on bullet length).
    www.ar15.com/forums/ar-15/1_9_twist_vs_1_7/12-5…
     
  3. People also ask
    Should I use a 1/7 or 1/8 twist barrel?From the looks of the numbers, you can see why I advocate that most shooters are just fine with a 1/7 or 1/8 twist barrel for their AR-15 rifles. I know the 1/7 with 55 gr shows 3.6, which is high, but it continues to function well for me. Since I usually shoot 62, 75, or 77 gr ammo though, a 1/7 works great as an all-rounder.
    What's the difference between 1 7 twist and 1 9 twist?With a 1:9 twist I am not limited to the heavy bullets - the 1:9 will shoot heavy stuff too, while the 1:7 twists wont. Has anybody empirically tested their rifles? I actually wanted to test differant rounds in my 16" 1:7. Got to the range yesterdat.
    What is the twist rate of a gun barrel?A gun barrel’s twist rate (aka rate of twist or barrel twist) indicates how many inches it takes its rifling to make one complete rotation. Twist rate is expressed as a ratio of 1:X” (i.e. 1 turn per X inches). It’s easier to understand twist rate with an example. Suppose a 20” barrel has a twist rate of 1:10”.
    What does 1/7 twist mean on an AR-15?So, when you see 1/7 twist, as found on mil-spec AR-15 barrels, that means one rotation for every seven inches of barrel. On a 20″ barrel, that means the bullet rotates nearly three full turns before exiting. If that were a 20″ .308 barrel with the common 1/10 twist, the bullet would rotate twice.
     
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    WebJun 25, 2019 · A 1-9" will stabilize anything you can push out of a magazine fed AR-15 in .223/5.56. However, if you want to single feed longer bullets you can make use of the 1-7" twist. Or, shoot tracers, you'll need that 1 …

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    WebAug 3, 2020 · A 1:7 twist means the bullet turns a full 360 degrees every seven inches of barrel. Nine inches of travel for each rotation gives the barrel a 1:9 rifling rate. Some European manufacturers indicate distance …

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