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Thread: Re-chambering a barrel?

  1. #1

    Question Re-chambering a barrel?

    Dear all,

    Please can you tell me if it is feasable to re-chamber an existing barrel? In my case I would like to re-chamber from 7x57 to 7x57 Ackley Improved, with the 40 degree shoulder to fit the commercially available reloading dies.

    I have seen on many gunsmiths web-sites that they refuse to do this job, is it because of the factory chambered barrel steel being too hard to work, presumably being work hardened during the button rifle swaging process?

    I realise that this is a fairly silly enterprise, there being absolutely nothing wrong with the 7x57, but I just have a hankering to have something a little different ;-) And as P.O.Ackley says in his book about the 7x57 AI, "It has almost ideal powder capacity for the 7mm bore and produces very satisfactory ballistics."

    Regards, Simon

  2. #2
    to be honest purley on a finaicial argument , time you pay for a rechamber and reproof its more cost effective to get a new barrel blank and start afresh.

    What shot count has the barrel done to date?
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  3. #3
    Simon,

    1. I ain't no gunsmith and

    2. I have idled away many an hour with Parker Ackley's books 1 & 2


    This is what I think in answer to your question.

    When Parker Ackley was writing, there seems to have been, in the USA at least, a much wider acceptance of the practice of rechambering barrels which might have had two contributory causes: i) Spare cash was a lot harder to come by and consequently "recycling" would have been a necessity to keep down costs and ii) a glut of milsurp barrels kicking around just begging to be "recycled".

    Compare that situation with present times: we don't so much rebarrel as replace, riflesmiths aren't exactly short of work and appear to be able to name their own prices and timescales. If you think about the comment about work hardening after button rifling, that's going to apply any rifled barrel which is chambered after the rifling has been cut: how many rifles are chambered then drilled and rifled?

    Here's a bit of a SWAG: riflesmiths would rather sell you a new barrel than work on your second-hand barrel and some of them might even hide behind insurance and the "potential" for insured liability in the event of something going wrong.

    So, is it feasible you ask? Yes, I'd say so.


    .
    Quote Originally Posted by flytie View Post
    Dear all,

    Please can you tell me if it is feasable to re-chamber an existing barrel? In my case I would like to re-chamber from 7x57 to 7x57 Ackley Improved, with the 40 degree shoulder to fit the commercially available reloading dies.

    I have seen on many gunsmiths web-sites that they refuse to do this job, is it because of the factory chambered barrel steel being too hard to work, presumably being work hardened during the button rifle swaging process?

    I realise that this is a fairly silly enterprise, there being absolutely nothing wrong with the 7x57, but I just have a hankering to have something a little different ;-) And as P.O.Ackley says in his book about the 7x57 AI, "It has almost ideal powder capacity for the 7mm bore and produces very satisfactory ballistics."

    Regards, Simon

  4. #4
    Quote Originally Posted by tikkathreebarrels View Post
    Simon,

    1. I ain't no gunsmith and

    2. I have idled away many an hour with Parker Ackley's books 1 & 2


    This is what I think in answer to your question.

    When Parker Ackley was writing, there seems to have been, in the USA at least, a much wider acceptance of the practice of rechambering barrels which might have had two contributory causes: i) Spare cash was a lot harder to come by and consequently "recycling" would have been a necessity to keep down costs and ii) a glut of milsurp barrels kicking around just begging to be "recycled".

    Compare that situation with present times: we don't so much rebarrel as replace, riflesmiths aren't exactly short of work and appear to be able to name their own prices and timescales. If you think about the comment about work hardening after button rifling, that's going to apply any rifled barrel which is chambered after the rifling has been cut: how many rifles are chambered then drilled and rifled?

    Here's a bit of a SWAG: riflesmiths would rather sell you a new barrel than work on your second-hand barrel and some of them might even hide behind insurance and the "potential" for insured liability in the event of something going wrong.

    So, is it feasible you ask? Yes, I'd say so.


    .

    Couldn't of put it better myself! It's not a difficult job, why replace a barrel if there's nothing wrong with it??? All you're doing in this case is bumping the chamber forward and accounting for this on your shoulder and headspace...not rocket science and no need for a new barrel.

  5. #5
    Quote Originally Posted by Jager SA View Post
    Couldn't of put it better myself! It's not a difficult job, why replace a barrel if there's nothing wrong with it??? All you're doing in this case is bumping the chamber forward and accounting for this on your shoulder and headspace...not rocket science and no need for a new barrel.
    #this does depend a lot on used barrel life and actuall condition of the barrel .

    Would you really want to spend xyz plus proofing on a fire cracked barrel. I agree a lightly used barrel being set back and rechambered is a very feeasable job but condition of the barrel is KEY.
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  6. #6
    Quote Originally Posted by 1967spud View Post
    #this does depend a lot on used barrel life and actuall condition of the barrel .

    Would you really want to spend xyz plus proofing on a fire cracked barrel. I agree a lightly used barrel being set back and rechambered is a very feeasable job but condition of the barrel is KEY.
    Yes of course barrel life is key, that's what bore scopes are for. Surely the fire cracking if any will be where you are removing material...however, I doubt there will be any issue with this in a 7x57...a wildcat yes and in a short space of time is the load used is stoked.

    This isn't a difficult task, however one would require a reamer the rest is time.

  7. #7
    Hi James i was talking in general terms . Agree though that if the calibre isnt to stoked up , it should be fine .
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  8. #8
    Quote Originally Posted by flytie View Post
    Dear all,

    Please can you tell me if it is feasable to re-chamber an existing barrel? In my case I would like to re-chamber from 7x57 to 7x57 Ackley Improved, with the 40 degree shoulder to fit the commercially available reloading dies.

    I have seen on many gunsmiths web-sites that they refuse to do this job, is it because of the factory chambered barrel steel being too hard to work, presumably being work hardened during the button rifle swaging process?

    I realise that this is a fairly silly enterprise, there being absolutely nothing wrong with the 7x57, but I just have a hankering to have something a little different ;-) And as P.O.Ackley says in his book about the 7x57 AI, "It has almost ideal powder capacity for the 7mm bore and produces very satisfactory ballistics."

    Regards, Simon
    hi Simon
    i had one ackley d in 7 . O8
    easy enough job as others have said just need a smith to obtain the reamer
    ​regards pete

  9. #9
    Quote Originally Posted by flytie View Post
    Dear all,

    Please can you tell me if it is feasable to re-chamber an existing barrel? In my case I would like to re-chamber from 7x57 to 7x57 Ackley Improved, with the 40 degree shoulder to fit the commercially available reloading dies.

    I have seen on many gunsmiths web-sites that they refuse to do this job, is it because of the factory chambered barrel steel being too hard to work, presumably being work hardened during the button rifle swaging process?

    I realise that this is a fairly silly enterprise, there being absolutely nothing wrong with the 7x57, but I just have a hankering to have something a little different ;-) And as P.O.Ackley says in his book about the 7x57 AI, "It has almost ideal powder capacity for the 7mm bore and produces very satisfactory ballistics."

    Regards, Simon
    The 7x57 Improved is about the same as a 280 Remington.
    AS to rechambering: In the US, running an Ackley reamer into an existing barrel is common place. I have done many myself... as did Ackley, I might add. Ackley rechambered many factory barrels and, indeed, the entire concept was developed to be used 'improving' existing barrels because the parent cartridge was too small for the bore diameter to give best performance, or to increase the chamber size of larger cartridges so that they could better utilize the cheap, slow burning surplus military powders of the time. The opinions offered in your second paragraph, to summarize, are bull crap. The barrels are rifled before chambering, as are all button rifled barrel blanks. Total nonsense. The things people will say to get you to buy a barrel job from them.~Muir

  10. #10
    I am no expert but if you can find a DECENT gunsmith that's willing to do this for you on an old/factory barrel then it maybe worth a go! But I doubt very much that they will promise it will work and to wheather it will shoot afterwards! Had it done on a factory sako a few years ago! It shot ok after but i was told before it was done by the gunsmith that if it didn't shoot he would not stand by it and it was me carrying the risk! If it's gonna cost say circa 200-300 then I would seriously have second thoughts as this will go along way towards a new barrel and for what you will gain plus cost of new dies etc... You have to ask yourself is it really worth it! As your question in your post is it feasible? It's possible but not feasible in my eyes.

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