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Thread: Twist Rate Calculator

  1. #11
    Senior Member Zhills's Avatar
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    I'm going to say it depends on the gun. The .223 wylde I built has a 1:8 on an 18" barrel. I sighted it using 62gn hp. Which is also what I will be using for varmits. The ranch owner also a very qualified smith gave me some 55gn fmj he had loaded probably to the max with cfe223. I was surprised it stayed on center but shot about 6" high.

  2. #12
    Aim true ! NGF Addict! Coalcracker's Avatar
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    Ok cool thanks. Good to learn new things.
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  3. #13
    Senior Member Zhills's Avatar
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    Interesting that barrel length is not included in the calculator.

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  5. #14
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    I often wondered about barrel length. I found one of my bullets on top of a log. I could see the grove marks. But not much twist. Must have been from one my pistols. I think it was from my Ruger,
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  6. #15
    Senior Member Zhills's Avatar
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    Longer the barrel the more rotation, better stabilization so it should be a factor.
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  7. #16
    Senior Member NGF Addict! Northtidesix's Avatar
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    I have always been a fan of the 26-28" heavy varmint barrels for my long legged rifles. I a 1:8 twist for the 6mm 06 was a nice combination back in the 70's. Kinda got hooked on it.
    Recently I started doing the center fire high velocity .17 and .224 bullets with similar twist and shorter barrels. I don't see much difference in the accuracy. But I am not shooting out beyond 200m anymore, unless it is with a .45/70 or .50/70. Then I can take a coffee break between shots and impact.
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  8. #17
    Senior Member NGF Addict! AgedWarrior's Avatar
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    Velocity and barrel twist is what determines the rpm of the bullet. The longer the barrel, the velocity is increased which increases rpm of the bullet, which of course is also varied by the twist of the barrel. The “Calculator” uses velocity which is in part a product of barrel length, but if one uses actual muzzle velocity, barrel length is not essential for the calculations.
    Knowing when and how...

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