Left hand twist barrels?

Discussion in 'Main Message Board' started by muleman69, Nov 4, 2018.

  1. muleman69

    muleman69 USMC -1st marine Div. RVN Gold $$ Contributor

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    I have been reading up on this but still not sure what to believe? Can anyone out there enlighten me as to the real reason for left twist?
     
  2. Dan S

    Dan S J III:XVI Silver $$ Contributor

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    Because your trigger finger pulls gun to right, so left twist is suppose to balance it out. Not sure I believe it myself
     
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  3. muleman69

    muleman69 USMC -1st marine Div. RVN Gold $$ Contributor

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    So in reality a right twist would tend to pull right along with your trigger finger. Be interesting to no how much a left twist would overcome this force? I no a heavy rifle and lite trigger etc.etc.would have to make a big difference as well.
     
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  4. Dan S

    Dan S J III:XVI Silver $$ Contributor

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    That is exactly what I was told by a barrel maker.
     
  5. Dan S

    Dan S J III:XVI Silver $$ Contributor

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    There can also be some kind of effect for super long range shooters, with earth spin. But that’s a guess
     
  6. muleman69

    muleman69 USMC -1st marine Div. RVN Gold $$ Contributor

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    I have read quite q few post in different forms and a lot of things were brought up but no real conclusions that I could see
     
  7. Milo 2.0

    Milo 2.0 Gold $$ Contributor

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    Bullet impact 2.jpg
    I have a left tw Chanlyn 7mm barrel in Saum, supposedly you can flop this chart over and it will be correct, it is for right tw barrels. I have found it to be close.
    On the trigger pull thing, I'd work on it before ordering a left tw barrel. I've yet to take a LR shot where I could claim that the earths spin did anything to my bullet.
     
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  8. butchlambert

    butchlambert Site $$ Sponsor

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    Winter time is setting in!
     
  9. riflewoman

    riflewoman Gold $$ Contributor

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    I believe the British found it was less prone to coriolis effect for long range volley firing. The advantage was very slight but it was there. That was the reason for the Lee-Enfield switching after the Boer War.
     
  10. theMadAlaskan

    theMadAlaskan Gold $$ Contributor

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    Seems to me with a left twist barrel, as the bullet impacts the lands and is forced to twist left the barrel will want to twist right. Equal and opposite reactions.
    Yup, winter is getting close. :)
     
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  11. butchlambert

    butchlambert Site $$ Sponsor

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    Did the British win that War?
     
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  12. riflewoman

    riflewoman Gold $$ Contributor

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    Yes, but their entire weaponry, tactics and Musketry changed as a result. They got beat up pretty bad in that war and it was only superiority in numbers that prevailed.
     
  13. moondog

    moondog Gold $$ Contributor

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    I own and shoot mostly left twist Chanlynn barrels. Mostly cause that's what he does and he makes damn good barrels.
    The "other" forum has made claims of the virtue of left twist being correct in this
    Hemisphere. Everybody over there jumps on that theory and has to have a left gain twist
    or be left with inferior, incorrect tubes.
    I'm calling it B.S. What I find in my game is if your shooting with a group of guys (PMS
    style) if your shooting left and everyone else is shooting right or vs versus. In a 90* wind, your hold WILL be different.
     
  14. Milo 2.0

    Milo 2.0 Gold $$ Contributor

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    What? I thought I kind of said the same thing, flop the chart. That PMS crowd a tough bunch, I get the same interaction with the little woman.
     
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  15. muleman69

    muleman69 USMC -1st marine Div. RVN Gold $$ Contributor

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    Thats a cool chart
     
  16. damoncali

    damoncali Gold $$ Contributor

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    There really isn’t a reason for it. You have to spin it one way or the other. It impacts the direction of spin drift and other spin dependent aero effects, but they’re there either way.
     
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  17. FrankG

    FrankG

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    As has been pointed out.....the spin drift will be opposite of a RH twist barrel.

    Can it help counter the coriolis effect? I will say yes but I will say even the top shooters shooting at a 1k yards will be hard pressed to tell the difference.

    Pope the very late great barrel maker would never make a RH twist barrel. He said the southpaw shooters can suffer! His claim was that a LH twist barrel for a RH shooter will torque the gun into the shooter and the shooter will control the rifle better. Remember when he was in his prime of barrel making it was common for a off hand rifle to be chambered in calibers like .38-55, .32-40, .40-63. A normal bullet weight for a .40 was like 330 grains. Even at blackpowder cartridge velocities that will have a lot of recoil in a 10# off hand rifle.

    Myself being a LH shooter and have shot primarily RH twist barrels....One time at the range and not thinking of it I was shooting a 1917 Enfield and a 1903 Springfield. The Enfield has LH twist rifling and of course the 1903 is RH twist. Both guns in .30-06 in there original military configuration. When I went from one gun to the next at first I couldn’t figure out why they felt totally different then it dawned on me. The Enfield was actually torquing away from my cheek. I can feel the difference.

    Will it make a difference in calibers and torque like a 6mm, 6.5mm or even a standard .308win.? Probably not.

    We’ve made LH twist barrels for some bench shooters who have said with they’re stock set up etc...the rifle recoiled more in a straight line and seemed more controllable. Off hand I think this is hard to prove. Too many variables in stock designs,
    Barrel weights, contours and calibers etc... but if it works for you then to me it’s up to each individual shooter and what they think and feel. Part of our game is in our head.

    You would have to run some sort of a controlled test in my opinion to come to a accurate conclusion.

    In most popular calibers we will make LH twist barrels at no extra charge.

    Later, Frank
    Bartlein Barrels
     
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  18. muleman69

    muleman69 USMC -1st marine Div. RVN Gold $$ Contributor

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    Thank you, very informative for sure
     
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  19. Rustytigwire

    Rustytigwire Gold $$ Contributor

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    There are forum members Down under. Any experience or opinions?
    Long range math people?
     
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  20. Tim Singleton

    Tim Singleton Gold $$ Contributor

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    It seems to me like I have had a hard time dealing with a stiff left to right green flag push. I just can’t get a tune that doesn’t seem to move twice as far as a red condition of the same intensity

    Is it in my imagination? I don’t think so at 100-200 yards it seems the right twist barrel will move more with the wind from left to right
     

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