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Thread: can you rechamber a 308 barrel into 300WinMag?

  1. #1

    can you rechamber a 308 barrel into 300WinMag?

    physically possible?

  2. #2

  3. #3
    Technically yes but would depend on what barrel it is. If a light wait sporter there might not be enough meat left in it for a long cartridge chamber. Also if your using the 308 action it is too short as 300WM is a long action.

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  4. #4
    Quote Originally Posted by auquhollie View Post
    Technically yes but would depend on what barrel it is. If a light wait sporter there might not be enough meat left in it for a long cartridge chamber. Also if your using the 308 action it is too short as 300WM is a long action.

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    ah good point!
    OK then, what if I had a 30-06?

    more likely?

  5. #5
    Quote Originally Posted by bewsher500 View Post
    ah good point!
    OK then, what if I had a 30-06?

    more likely?
    yes with a 30.06 as thats a long action BUT the cost of the machining would be the same as if you bought a new barrel,for the extra few couple of hundred quid you may as awell have a good barrel fitted in the length and twist your want,not many smiths will re chamber and old barrel into another caliber,you would struggle to have enough tennon on the stad barrel to be able to re machine it

  6. #6
    Re-chambering to larger cartridges is common in France. Kettners used to carry Mosin Nagants re-chambered to 308 Norma and K98's to 6x68S.

    Funny thing is that thy didn't seem to have a problem with this or proofing them under CIP. Yet here in the UK it's not possible and MUST have anew barrel.


    Hmmm can anyone else smell that smell .................................................. .............. ahh that's it Fish!

    In fact when I enquired about having the brand new BSA barrel in 7x64 re-chambered to .280 AI one rather famous "Gunsmith" quoted over 800 for the job. Now I know his work is not cheap but that was just stupid.

    Rip off Britian is alive and well.

  7. #7
    SD Regular bobjs's Avatar
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    you have to shop around Ed,

    I'm sure there are some good smiths out there that don't have a page in rip off britain's best magazines so to speak, and a chat with like minded folk on here will soon tell you who and where to got to for a good deal/job on the rifle etc.

    purse strings closed and off out till laters.

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  8. #8
    BH is right, there's a lack of actually 'working' with what you've got today, which seemed perfectly normal just a few years ago. These days there's far too much focus on 'disposable' products, want anything changed, scrap the stock, replace with plastic, scrap the barrel, replace with a new SS, bluing is getting worn off, scrap the barrel and replace, recoil pad is getting worn, 125 to replace..might as well buy a new T3.

    so much b0ll0cks. this whole disposable, cheap chinese imports then throw away once used-mentality is the reason quality artisan skill sets are getting lost and the oceans are flooding with trash.

    too few quality products getting made and maintained for a 'life's worth of use' these days...

  9. #9
    Quote Originally Posted by Brithunter View Post
    Yet here in the UK it's not possible and MUST have anew barrel.
    Why?

    I am under the impression that an awful lot of post WW2 303 calibre Bren guns were rechambered into 7.62.........

    I can see no law existing that would prohibit it, only physics of having enough meat on the breach end of the barrel and finding someone who was willing to do it.


    thing is 30-06's are all over the place, magnum action, 12mm vs 13.5mm max case width, only physical issue I can see is a .30-06 chamber pressure rating of 50k CIP vs 54k CIP for the .300Win Mag

  10. #10
    You'll also have to have the bolt face opened up if you are working with an eixsting rifle. If it's a chambered barrel, then there won't be a problem. Rechamber, spin it onto your action, headspace and send off for proofing. Oh, and paperwork, of course.

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