Measuring groups

Discussion in 'General Marlin Discussion' started by FOUR4D4, Jun 30, 2012.

  1. FOUR4D4

    FOUR4D4 Moderator Moderator

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    Whats the prober method used for measuring groups inside diameter or center to center?I guess its time to google :D
     
  2. axxe55

    axxe55 Well-Known Member

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    Four, i think it's center to center. but not 100% sure.
     

  3. FOUR4D4

    FOUR4D4 Moderator Moderator

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    Thats what i was thinking Axxe
     
  4. Falcon

    Falcon New Member

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    I was always told outside shots, center to center across the group. May be wrong but thats what I do.
     
  5. squirrelhunter

    squirrelhunter Well-Known Member Lifetime Supporting

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    Center to center's what I've always heard.
     
    Last edited: Jul 2, 2012
  6. 28Shooter

    28Shooter Well-Known Member Lifetime Supporting

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    I was always taught that it was center-to-center.
     
  7. tahoe2

    tahoe2 Well-Known Member

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    all of the above are correct; center to center of the farthest spread.:)
    usually I get three to four tight and then they start to open up from a heated barrel,
    that's because I get impatient waiting for the barrel to cool down.
    I usually shoot a full magazine, whatever that is (3,4,or 5 shots), same with pistols
    or revolvers(full cylinder or magazine)
     
    Last edited: Jul 2, 2012
  8. FOUR4D4

    FOUR4D4 Moderator Moderator

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    I have been measuring them from the edge :eek:
     
    Last edited: Jul 2, 2012
  9. duster066

    duster066 Well-Known Member Supporting

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    You shoot better than you thought!
     
  10. squirrelhunter

    squirrelhunter Well-Known Member Lifetime Supporting

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    That depends on if it's "inner" or "outer" edge ;) :D.
     
  11. axxe55

    axxe55 Well-Known Member

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    if someone could post some pictures and measure the group sizes and explain how it was done would be helpful to many of us.
     
  12. FOUR4D4

    FOUR4D4 Moderator Moderator

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    There has always been a controversy on the correct way.
     
  13. Fomdiddle

    Fomdiddle Well-Known Member

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    If you will measure outside to outside of the furthest shots then subtract the caliber it should give you the correct center to center group size. Fom
     
  14. CallMaker

    CallMaker Active Member

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    Outside measurement of the furthest shots less bullet diameter equals group size center to center.
     
  15. sgtcowboyusmc

    sgtcowboyusmc Active Member

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    I just measure from the approximate center of the two farthest shots. I have never had to, on my own shooting, measure down so close that I needed to be more accurate than that.
     
  16. FOUR4D4

    FOUR4D4 Moderator Moderator

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    How to Measure Group Size.

    The size of the group is all that counts, there are no scoring rings on the target. Using a micrometer, the group size is measured at it`s two farthest points (largest outside diameter). The diameter of the bullet (in thousandths of an inch) is subtracted from that measurement to produce the true group size. Shooters fire from sturdy benches with the rifle supported by a rest and may have as long as 15 minutes to fire their group.�
     
  17. FOUR4D4

    FOUR4D4 Moderator Moderator

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    ammosmith strikes again :d
     
  18. SWO1

    SWO1 Well-Known Member Lifetime Supporting

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  19. carlk418

    carlk418 Member

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    15 minutes to fire a group? If I took that long, my shooting buddies would fall asleep waiting for me to finish... :D