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Thread: Quick question on rate of twist...



  1. #1
    Tinhorn
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    Quick question on rate of twist...

    So I am looking at the 185 grain Berger VLD bullets to do some handloads. It recommends on the box a rate of twist that is 1 in 12 or faster. My XL7 is a 1 in 10. The logical part of my brain thinks that 1 in 12 is faster than 1 in 10. I hope that I am wrong.

    If this is so... will this really affect my accuracy?

    Thanks,

    JDC
    Team X7 - .30-06 #29

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    Wrangler
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    1 in 10 is faster rate of twist than 1 in 12 - theoretically the bullet will make one 360 degree spin in the length of barrel given. So the lower the barrel length the faster the rate of twist.
    So a 24" barrel with a rate of twist of one in twelve will make two revolutions before exit .
    Tom
    Marlin 336 30-30 , 1894cs .357 , 39A , 1894CB 45LC , 1895 Limited V 45-70 , X7 .243 , 917 17 HMR [XT-17]
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    Congratulations, you got your wish. 1 in 12 is slower than 1 in 10. One turn every 12 inches vs one turn every 10 inches. Twist rate can have definite affect on long bullets. This comes into play with some of the newer non-lead bullets that require more length to get the same weight for caliber. This came to be an issue with the 5.56 NATO vs 223 commercial loadings. The NATO bullets are heavier than the original commercial loadings and the only way to make 22 bullets heaver is to make them substantially longer.

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    Please forgive me for asking here,
    Will a "faster" twist stabilize heavier or lighter bullets better?
    ...its not a collection if you only have one....

  5. #5
    Tinhorn
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    Faster twist will stabilize heavier bullets. but when you are on the edge velocity also comes into play.

  6. #6
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    Quote Originally Posted by mrbofis View Post
    Please forgive me for asking here,
    Will a "faster" twist stabilize heavier or lighter bullets better?
    It's a factor of length rather than weight. The reason that weight becomes involved is that the shorter bullets in a given caliber are usually lighter than a longer bullet of the same diameter. As a general statement, a longer bullet requires a faster rate of twist than a shorter bullet in the same caliber. The under stabilized bullets will 'keyhole' or tumble at some distance from the muzzle and accuracy is lost. In calibers like the 308, 30-06, etc. this has become an issue due to the use of lead free bullets in the heavier weights. A lead free 200 grain 30 caliber bullet has to be substantially longer than a lead bullet due to the density of the material used so a twist rate that stabilized a 200gr lead bullet may not stabilize a 200gr copper or gliding metal bullet.

  7. #7
    DWB
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    Like vwguy mentioned, when you are on the edge, velocity also comes into play. And, as others have also mentioned, barrel with a faster twist will stabilize a longer bullet... That doesn't necessarily mean that a faster twist will shoot a shorter bullet even better...

    As an example, in one of my .223's with a 1:8" twist, it shoots 75 gr BTHP Match (at ~2,800 fps) ammo wonderfully, it shoots 68 gr BTHP Match ammo (at ~2,875 fps) even better, however, with 52 gr HPBT Match ammo (~3,100 fps) the groups beyond 200 meters are terrible, and in fact, that bullet is overstabilized from that barrel until I drop the velocity down to the 3,000 fps neighborhood. The 52 gr load at ~3,100 fps shoots very well from a 1:12" barrel, but the same bullet in the ~3,000 fps load isn't nearly as accurate in the same rifle.

    Short story is... Depending on the caliber of your XL7 (which you didn't mention), with a 1:10" twist, it may handle those {particularly long} 185 gr VLD Bergers... Only one way to find out if your rifle likes them or not...

  8. #8
    Wrangler
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    Ain't nothing ever as simple as it ought to be is there?

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    Quote Originally Posted by quickfire View Post
    Ain't nothing ever as simple as it ought to be is there?
    Its simple if you try it and groups good - If it doesn't its complicated LOL
    msharley likes this.
    Tom
    Marlin 336 30-30 , 1894cs .357 , 39A , 1894CB 45LC , 1895 Limited V 45-70 , X7 .243 , 917 17 HMR [XT-17]
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  10. #10
    Tinhorn
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    Quote Originally Posted by DWB View Post

    Short story is... Depending on the caliber of your XL7 (which you didn't mention), with a 1:10" twist, it may handle those {particularly long} 185 gr VLD Bergers... Only one way to find out if your rifle likes them or not...
    It is a .30-06... It is in my signature

    Thanks for the info!
    Team X7 - .30-06 #29

    Benelli SuperNova - 12G
    Ruger BlackHawk - .357 Mag
    Marlin XL7 - .30-06
    Taurus Tracker - .44 Mag


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