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What is the 45 in 5.56x45mm?

Discussion in 'Reloading' started by wdphillips, Nov 17, 2011.


  1. wdphillips

    wdphillips
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    I was asked by my son, "what is does the 45 in 5.56x45mm stand for?". I am embarrassed to say that I could not answer the question.

    After 30 minutes of searching I still cannot answer the question!

    So I will ask the experts.

    What is the 45 in 5.56x45mm?
     

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  2. fgutie35

    fgutie35
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    the lenght of the case in millimiters, which is 4.5 centimeters.
     

  3. GioaJack

    GioaJack
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    Conifer Jack

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    ... equal to the length of your private part. What an amazing coincidence. :whistling:


    Jack
     
  4. wdphillips

    wdphillips
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    According to the specification the length of the case is 44.70mm. Being an engineer I did not round up.

    Should I?
     
  5. wdphillips

    wdphillips
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    That is what happens when you get old. It hides!:embarassed:
     
  6. fgutie35

    fgutie35
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    After you fire, the case will round up by itself to 45mm.:supergrin:
     
  7. G21FAN

    G21FAN
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    Useless loser
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    Ornery today Aint ya?
     
    #7 G21FAN, Nov 17, 2011
    Last edited: Nov 17, 2011
  8. Hogpauls

    Hogpauls
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    Umm, how might you know this information?
     
  9. PCJim

    PCJim
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    One huge scandal in college football two weeks ago with another initiated today, and now one on GT?