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Thread: Barrel threading

  1. #1

    Barrel threading

    The outside diameter of the barrel on my 243 WSSM is 13.77 mm will there be enough shoulder to tighten a mod against if I have it threaded 1/2" unf.
    AT THE AGE OF 50 I DECIDED I WAS GOING TO GROW OLD F***ING DISGRACEFULLY

  2. #2
    I would not like to rely upon that after all 1/2" is 12.7mm so at most you will have only 0.020" shoulder that's 0.5mm. it would probably work with a spigot for the moderator to align onto but your asking a lot of that twenty thou IMHO.

  3. #3
    This is a good case for a close tolerance spigot mod fitment as Brithunter said. - A thin whippy barrel can often encourage the mod to unscrew if there is not enough shoulder face area to lock up on, -- wobbly mod soon knackers the threads making it worse still -- accuracy then suffers & there is a stronger likelyhood of an accident/breakage.
    An option may be there to shorten the barrel to leave more shoulder - or my favourite, don't fit a mod.

    Ian

  4. #4
    You'll get away with a 21" barrel on this with no discernible loss of velocity or accuracy. I recently reduced the barrel on a 243 wssm and it shoots very well. If you measure the barrel back at 21" you may find you'll gain a slightly better dia for a good shoulder, as said, a spigot would work fine but isn't necessary if your shoulder suitable.
    I would also opt for either a 14x1 or 1/2" unef 28 Tpi.
    Last edited by Jager SA; 13-06-2014 at 08:58.

  5. #5
    I'd have it threaded at x28 with a spigot, you could use any moderator that has a removable
    thread unit.

    Neil.

  6. #6
    Quote Originally Posted by Jager SA View Post
    You'll get away with a 21" barrel on this with no discernible loss of velocity or accuracy. I recently reduced the barrel on a 243 wssm and it shoots very well. If you measure the barrel back at 21" you may find you'll gain a slightly better dia for a good shoulder, as said, a spigot would work fine but isn't necessary if your shoulder suitable.
    I would also opt for either a 14x1 or 1/2" unef 28 Tpi.
    +1 Fully agree with James
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  7. #7
    no, 20thou per side is not enough.
    callum ferguson builds my rifles, because he is the best and i'm worth it....

  8. #8
    Shortening the barrel to 21" wont help as the barrel is only 21 1/2" now, so can someone explain about a spigot.
    AT THE AGE OF 50 I DECIDED I WAS GOING TO GROW OLD F***ING DISGRACEFULLY

  9. #9
    Quote Originally Posted by sikadog View Post
    can someone explain about a spigot.
    Try this first which thread for mod on browning x-bolt 308 win
    Then you will find the thread specs on the Jackson Rifle web page.
    A spigot thread can be done in any size you like, the stumbling block is the moderator.
    Any of the mod's with a removable thread section could be used, either by getting a blank
    thread unit to machine at the same time as the barrel is threaded, or by ordering a special.

    Neil.

  10. #10
    A good thread cut by some one who knows what they are doing does not need a spigot to align it, it aslo does not need a shoulder for the mod to butt up against, you cant screw a mod on any further then the thread length allows.

    Ian.

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