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#6185377 - 02/15/16 10:41 PM Why is right hand twist so common?
Sneaky Offline
The "Grouch"

Registered: 10/22/12
Posts: 16895
Loc: Winters
In the Northern Hemisphere? Doesn't a left hand twist offer advantages at distance?
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#6185425 - 02/15/16 11:56 PM Re: Why is right hand twist so common? [Re: Sneaky]
Classic Rocks Offline
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Registered: 09/18/12
Posts: 1913
Cause most barrel cutters are right handed? Perhaps lathes or hammer forges run right handed?
Good question!
Do toilets swirl backwards in Australia?
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#6185444 - 02/16/16 01:36 AM Re: Why is right hand twist so common? [Re: Classic Rocks]
Toxarch Online   content
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Originally Posted By: Classic Rocks
Do toilets swirl backwards in Australia?

As a matter of fact, toilets in the Southern hemisphere do swirl the other direction.
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#6185528 - 02/16/16 07:01 AM Re: Why is right hand twist so common? [Re: Sneaky]
specialed309 Offline
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Registered: 01/24/16
Posts: 142
Yep. Not to mention recoil index's into you and not away from you, if you are a right handed shooter, for higher caliber rifles.

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#6185771 - 02/16/16 09:41 AM Re: Why is right hand twist so common? [Re: Sneaky]
FiremanJG Online   content
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Originally Posted By: Sneaky
In the Northern Hemisphere? Doesn't a left hand twist offer advantages at distance?


How would it?
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#6185829 - 02/16/16 10:20 AM Re: Why is right hand twist so common? [Re: FiremanJG]
Sneaky Offline
The "Grouch"

Registered: 10/22/12
Posts: 16895
Loc: Winters
Originally Posted By: FiremanJG
Originally Posted By: Sneaky
In the Northern Hemisphere? Doesn't a left hand twist offer advantages at distance?


How would it?


Spin drift working against coriolis effect and not with it.
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#6185837 - 02/16/16 10:22 AM Re: Why is right hand twist so common? [Re: Sneaky]
Colt W. Knight Offline
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Registered: 03/22/11
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Edited by Colt W. Knight (02/16/16 10:23 AM)

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#6185840 - 02/16/16 10:24 AM Re: Why is right hand twist so common? [Re: Sneaky]
ChadTRG42 Online   happy
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Registered: 09/16/09
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Correct, a left hand twist would help at your much longer ranges to reduce coriolis, and I think reduce spin drift.
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#6185863 - 02/16/16 10:42 AM Re: Why is right hand twist so common? [Re: Sneaky]
Sneaky Offline
The "Grouch"

Registered: 10/22/12
Posts: 16895
Loc: Winters
That's the impression I get. So why aren't the barrel makers on the top half of the world getting this right? At some point, they had to make tools or upgrade them. Seems like a good time to switch over or at least add the option.
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#6185903 - 02/16/16 11:11 AM Re: Why is right hand twist so common? [Re: Toxarch]
Cast Online   happy
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Originally Posted By: Toxarch
Originally Posted By: Classic Rocks
Do toilets swirl backwards in Australia?

As a matter of fact, toilets in the Southern hemisphere do swirl the other direction.


WRONG!

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#6185909 - 02/16/16 11:15 AM Re: Why is right hand twist so common? [Re: Sneaky]
FiremanJG Online   content
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Registered: 12/16/08
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How's it going to work against coriolis. If shooting south to north you're looking at a target that is moving to the right. If you're shooting north to south you're looking at a target that is moving to the left. West to east, target is moving away, east to west, target moving closer. I don't even figure it in shooting a mile, I think the wind is a bigger factor to be concerned with.

Spin drift? One time has it ever come into play for me. Zero wind, 178 gr out of a .308, 800, 900, 1000 yards, watched the bullet drift right of the target at 800, with a solid zero and not a leaf flickering. Rare conditions.

Just my opinion.


I did hear a tale of a LH twist barrel that was RH threaded into the action. The barrel unscrewed itself from the action. Not totally, but did daylight barrel to action. wink
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#6185911 - 02/16/16 11:16 AM Re: Why is right hand twist so common? [Re: ChadTRG42]
FiremanJG Online   content
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Originally Posted By: ChadTRG42
Correct, a left hand twist would help at your much longer ranges to reduce coriolis, and I think reduce spin drift.


Spin is spin, be it left rotation or right rotation. How's it going to reduce drift?
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#6185986 - 02/16/16 12:05 PM Re: Why is right hand twist so common? [Re: Sneaky]
Sneaky Offline
The "Grouch"

Registered: 10/22/12
Posts: 16895
Loc: Winters
JG, go into your ballistics ap. Run the numbers on a load to a thousand yards, with no wind. The drift shown is your spin drift, right? Now edit the firearm to have a left twist, and run the same load with no wind. What does your spin drift show now?
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#6186002 - 02/16/16 12:14 PM Re: Why is right hand twist so common? [Re: Sneaky]
FiremanJG Online   content
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With no wind, I get no lateral movement left or right twist...
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#6186020 - 02/16/16 12:22 PM Re: Why is right hand twist so common? [Re: Sneaky]
Sneaky Offline
The "Grouch"

Registered: 10/22/12
Posts: 16895
Loc: Winters
Turn your spin drift and coriolis on.
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