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Hot Topic (More than 10 Replies) Gain twist liner? (Read 3435 times)
oughtsix
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Gain twist liner?
Feb 5th, 2013 at 9:56pm
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Any  one make a gain twist liner?

-06
  

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westerner
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Re: Gain twist liner?
Reply #1 - Feb 6th, 2013 at 6:50pm
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Commercial liners being thin walled are hammer forged.  Pretty sure liners are constant twist only. 

       Joe.   Smiley
  

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Schuetzendave
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Re: Gain twist liner?
Reply #2 - Feb 6th, 2013 at 7:03pm
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Joe:

If you took a RKS gain twist barrel blank; could you not machine it down to the width of a liner?

Expensive, but I suppose it could be done.
  
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Re: Gain twist liner?
Reply #3 - Feb 6th, 2013 at 7:49pm
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If done that way, Dave, should make the liner as large in diameter as possible. Taking it down as thin walled as a commercial liner may create variations in bore diameter. Internal stress?  Never tried it but was warned against it by a machinist.  He also mentioned something about "hoop strength".

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westerner
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Re: Gain twist liner?
Reply #4 - Feb 6th, 2013 at 8:02pm
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Then add to that the cost of or, extra work in grinding custom size piloted drills....... better to go with a commercial liner.  But then again, it's hard to keep a good gun crank down.  Wink

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40_Rod
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Re: Gain twist liner?
Reply #5 - Feb 7th, 2013 at 8:05am
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I think RKS will re-bore your barrel. Why not have it bored out and rifled with gain twist rifling?

40 Rod
  
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Re: Gain twist liner?
Reply #6 - Feb 7th, 2013 at 9:49am
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40 Rod - wouldn't that require a change in caliber?

You might ask John Taylor if he would make up a gain-twst barrel/liner. Think he can do so, but prefers not to as it is an expensive and time-comsuming process.
  

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John Taylor
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Re: Gain twist liner?
Reply #7 - Feb 7th, 2013 at 10:05am
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I guess I better jump in here, someone mentioned my name. Button barrels use a carbide button to force rifling in a barrel and are set for a certain twist, gain twist dose not work well with them. Hammer forged barrels use a mandrel that has the rifling on it and can not be made gain twist. Cut rifling is the only way to do gain twist. While I have a cut rifling machine I will not set it up for gain twist. This would require some  changes to the machine that I'm not willing to do sense I don't believe in gain twist to start with. There are several barrel makers that do gain twist that can make a liner.
  

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40_Rod
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Re: Gain twist liner?
Reply #8 - Feb 7th, 2013 at 10:40am
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Of course it would require a caliber change. The old grooves would have to be reamed out and then new cut. It usually requires about .010" larger, a .33 cal from 32 or a 39 from a 38. I never saw any requirement for the same caliber. I just thought if keeping the barrel was the goal it could be done.

40 Rod
  
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Re: Gain twist liner?
Reply #9 - Feb 7th, 2013 at 8:48pm
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For a hammer forged gaintwist liner, why not make a gaintwist mandrel. TJ's makes all kinds of liners, why not ask them?
  
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oughtsix
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Re: Gain twist liner?
Reply #10 - Feb 7th, 2013 at 9:16pm
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Thanks for all the response.   It was just a curiosity question that I had not heard  discussed.  Saw  a post about turning  a barrel down to make a liner and was  just wondering.

I think I'll  buy the  rifling machine on Ebay  so I can make my own...... maybe use pine for the rifling guide  ( or cedar,  that smells nice)      Who wants to invest??!

-06 Smiley
  

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Re: Gain twist liner?
Reply #11 - Feb 7th, 2013 at 10:05pm
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40-82Hepburn, If you made a Hammer Forge mandrel gain twist. How would you get the mandrel out of the barrel. Gain twist is a changing lead all the way through the barrel, not gonna come out no matter which way you push or pull it. Regards, FITZ. Smiley
  

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John Taylor
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Re: Gain twist liner?
Reply #12 - Feb 8th, 2013 at 8:53am
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40-82Hepburn wrote on Feb 7th, 2013 at 8:48pm:
For a hammer forged gaintwist liner, why not make a gaintwist mandrel. TJ's makes all kinds of liners, why not ask them?

Pacific Tool and Gauge is now making mandrels for hammer forged barrels, I think you should call Dave and ask if he will make a gain twist mandrel.  Cheesy
  

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Re: Gain twist liner?
Reply #13 - Feb 8th, 2013 at 10:23am
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The problem with a gain-twist mandrel is you are stuck with one set of rifling. Say starting at 1-in-20" and ending in 1-in-10" in a 30" barrel. That's it. Want a shorter/longer barrel or a different set of twists then you need another mandrel. A barrel from RKS or others seems an easier way to go.
  

Glenn
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Re: Gain twist liner?
Reply #14 - Feb 9th, 2013 at 10:36am
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I''d like to see how those TJ's Liners are made. Is the mandrel a completely reverse of the inside of the barrel?....If that's the case, how would you slide the madrel out of a gain twist liner?

Or is the mandrel only half of 3/4 round??

John Taylor did a TJ's liner for me in .45-70 on a Sharps '74....Couldn't be Better!

Just curious,
Terry Harper Smiley
  
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