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Thread: Grouping significance

  1. #1

    Grouping significance

    Having worked up a load for my new rifle (grouping at 3/4 inch @100) I then started adjusting seating depth to try and tighten the group up.

    Is there anything significant to be learnt when a grouping at one COL is a horizontal spread and then at another COL it is a vertical spread ?

    I have also had this occur when working up a load.

    Regards

    Sticks

  2. #2

  3. #3
    Quote Originally Posted by jcampbellsmith View Post
    Sticks

    This article is worth a read - http://www.angelfire.com/ma3/max357/houston.html

    Regards JCS
    My god thats a good read, thanks

  4. #4
    What a cracking and informative read , cheers JC.

  5. #5
    Quote Originally Posted by jcampbellsmith View Post
    Sticks

    This article is worth a read - http://www.angelfire.com/ma3/max357/houston.html

    Regards JCS
    Thanks JCS - - I enjoyed that.

  6. #6
    Super article, well worth the time to read.

  7. #7
    An interesting read but obviously a 'gunwriters' article, still dealing in hocuspocus! No tangible detail there.

  8. #8
    I worked up five loads at all the same COL and got a distinct horizontal "group" at the highest end of the charge.
    The three lowest all produced three shot groups that were almost vertical (more shots might have dispelled that theory but they were basically above each other!)
    by far the most accurate was the charge that was roughly 10-15% lower than factory (estimated at 2700f/s vs the factory 3015f/s)

  9. #9
    Quote Originally Posted by j0e_bl0ggs View Post
    An interesting read but obviously a 'gunwriters' article, still dealing in hocuspocus! No tangible detail there.
    I tend to agree. An interesting read but not exactly a tutorial. As to the subject of the post, what caliber, bullet and twist?~Muir

  10. #10
    Quote Originally Posted by Muir View Post
    I tend to agree. An interesting read but not exactly a tutorial. As to the subject of the post, what caliber, bullet and twist?~Muir
    .243 85g Nosler Partition 1:10 twist.

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