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Thread: caliber accuracy

  1. #1

    caliber accuracy

    Hi , after seeing several posts about how accurate certain calibres are (i.e. 6mm br) I would like to ask what makes certain calibres more accurate than others ?
    thanks , Connor

  2. #2
    Lots of factors involved.

    Mundane practicalities such as availability of good quality brass and bullets, for example.
    Short/fat powder column and small primer flash hole are meant to contribute to more uniform internal ballistics.
    Long enough neck to support bullet at appropriate seating depth.

    Case designs that rely on head spacing of a rim are often "pooh-poohed" as less accurate (though there are plenty of accurate 7mm Rem Mags, etc.)

  3. #3
    Has the 6.5x284 got a small primer

  4. #4
    nope, 6.5-284 is large rifle primer. doesn't have a long neck and a lot of the really accurate loads have loads of space left in the case....

    most calibers can be very accurate, if built using good components by a competent builder, then a good load worked up with good components. 6.5-284 is not any more accurate than any of the other full bore calibers.

    6mm PPC is easily the most accurate caliber, followed by 22PPC. 6mmBR is also very accurate, as are it's derivative such as 6mm dasher, 6brx etc. etc. 6mm swiss match, 6x47, 6.5x47 are all really easy to get to shoot well.......

    lots of different things contribute to accuracy, the caliber is just a part of the equation. it helps to start with something that is normally very accurate though....

  5. #5
    Quote Originally Posted by swarovski View Post
    Has the 6.5x284 got a small primer
    No mate , it has a large one

  6. #6
    beat me to it nowler - must of just ahead of me typing

  7. #7
    simple answer-the hut behind the trigger usually makes a calibre accurate

  8. #8
    Quote Originally Posted by xavierdoc View Post
    Mundane practicalities......[that] contribute to more uniform internal ballistics.
    Exactly, generally,
    Short, fat powder-column
    A 30/40 degree shoulder-angle
    Generally a long case-neck (which keeps the point where the shoulder angles would intersect if extended within the case neck).
    The availability of quality brass (Lapua, RWS orNorma).
    The availability of quality bullets (Fowler,Barts, Watson, Carteruccio. Benchrest)

    Some examples include 22/6PPC, 6BR Rem, 6.5x47,6.5-284, 6.5x55AI

    However, over 90% of accuracy comes from the quality of components surrounding the cartridge, load development
    and most of all the NUT behind the gun.
    Last edited by Sidewinder; 13-12-2013 at 10:43.

  9. #9
    Quote Originally Posted by Sidewinder View Post
    Short, fat powder-column
    A 30/40 degree shoulder-angle
    Generally a long case-neck
    worth noting there are some out there that are very accurate cartridges that defy the properties above

    long case
    short neck

  10. #10
    Quote Originally Posted by bewsher500 View Post
    worth noting there are some out there that are very accurate cartridges that defy the properties above

    long case
    short neck
    Agree, as I said "generally."

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