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What is the 45 in 5.56x45mm?

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

  1. 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?
     
  2. the lenght of the case in millimiters, which is 4.5 centimeters.
     


  3. GioaJack

    GioaJack Conifer Jack

    10,016
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    Apr 14, 2009
    Conifer, CO
    ... equal to the length of your private part. What an amazing coincidence. :whistling:


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

    Should I?
     
  5. That is what happens when you get old. It hides!:embarassed:
     
  6. After you fire, the case will round up by itself to 45mm.:supergrin:
     
  7. G21FAN

    G21FAN Useless loser Millennium Member

    1,616
    7
    Apr 23, 1999
    Pell City, Alabama
    Ornery today Aint ya?
     
    Last edited: Nov 17, 2011
  8. Hogpauls

    Hogpauls

    854
    0
    Nov 6, 2009
    Idaho
    Umm, how might you know this information?
     
  9. PCJim

    PCJim Senior Member

    2,950
    1
    Aug 4, 2008
    FL
    One huge scandal in college football two weeks ago with another initiated today, and now one on GT?