Smooth Twist Barrels?

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Smooth Twist Barrels?

Post by beeser on Mon Nov 14, 2016 10:48 am

It seems that the airgun community is finding some success with a proprietary smooth twist barrel made by FX Airguns.  The interior of the barrels are mostly smooth except for a small portion at the muzzle end.  Has anyone heard of this being used on firearms?

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Re: Smooth Twist Barrels?

Post by LenV on Mon Nov 14, 2016 11:01 am

Glock, H&K and others are using a polygonal barrel. Barrel is smooth inside but twisted. They don't work real well for lead bullets.

Len

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Re: Smooth Twist Barrels?

Post by beeser on Mon Nov 14, 2016 11:18 am

LenV wrote:Glock, H&K and others are using a polygonal barrel. Barrel is smooth inside but twisted. They don't work real well for lead bullets.

Len
I don't know anything about Glock or H&K barrels.  Are they smooth and without rifling for the most part and only have rifling toward the muzzle end?  Airgun pellets are also made out of lead.

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Re: Smooth Twist Barrels?

Post by Wobbley on Mon Nov 14, 2016 11:22 am

The problem would be bullet deformation near the muzzle.  Now a very long lead might be an interesting concept but hard to make concentric.

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Re: Smooth Twist Barrels?

Post by 1joel1 on Mon Nov 14, 2016 11:33 am

I was not aware that single hole accuracy needed improvement.

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Re: Smooth Twist Barrels?

Post by beeser on Mon Nov 14, 2016 8:13 pm

Improvements in barrel design do take place.  The question remains, has the FX "smooth twist" been applied to powder burning pistols?

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Re: Smooth Twist Barrels?

Post by rreid on Mon Nov 14, 2016 8:56 pm

Schuemann has a gain twist barrel. The rifling starts out parallel to the bore and starts to turn part way down type barrel. Same principle.

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Re: Smooth Twist Barrels?

Post by Jon Eulette on Mon Nov 14, 2016 9:01 pm

Back in 1840's, yes 1840's. They found that lapping a choke into the bore improved accuracy of slug rifles. Yes slug rifles in 1840's. So riflesmith would lap a choke into his barrel after rifling it. BUT they had full rifling. Barrels were typically octagon so 8 lands and grooves of various configurations. Sp I'm not surprised to hear an air gun is using old technology:)
Jon
By the way, those old rifles shot damn good!

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Re: Smooth Twist Barrels?

Post by Jon Eulette on Mon Nov 14, 2016 9:03 pm

Gain twist was designed to gently engrave rifling into bullet for less deformation. I think with a rifle it had more promise than a short pistol barrel. They have never been proven to shoot better than standard rifling.
Jon

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Re: Smooth Twist Barrels?

Post by beeser on Mon Nov 14, 2016 10:19 pm

Here's a link to a video that describes the FX "Smooth Twist" barrel.  It should clarify some of the misconceptions above.

https://www.youtube.com/watch?v=xPF6dWAqfhY

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Re: Smooth Twist Barrels?

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