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Spreadsheet for calculating chamber pressure

Discussion in 'Ammunition & Reloading' started by Benchrest, Jul 3, 2015.

  1. Benchrest

    Benchrest The Desert Planet Well-Known Member

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    Last edited: Jul 3, 2015
  2. Benchrest

    Benchrest The Desert Planet Well-Known Member

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    Edit
     
  3. jordanka16

    jordanka16 Albany, OR Active Member

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    Interesting idea but there's too many variables I think for plain math to get it right. I plugged in some numbers for 9mm+p ammo and got pressures in 5.56 ranges, not quite right.
     
  4. Benchrest

    Benchrest The Desert Planet Well-Known Member

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    Yeah, I don't think it's factoring rise time / other variables.

    Top published Power Pistol loads out of a 3" (according to how they measure) put pressures significantly above SAAMI.

    Entered my 'warmer' PP load, ouch!
     
    Last edited: Jul 3, 2015
  5. jordanka16

    jordanka16 Albany, OR Active Member

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    Yup, it seems to generally give numbers that are high, which I guess for safety's sake is a good thing. Mild loads seem to come up with numbers that are closer to measured levels.
     
  6. Benchrest

    Benchrest The Desert Planet Well-Known Member

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    1: When did they start using 'letters' in 'math'!
    2: It seems from the equation below that only peak pressure is used, treating it as a constant.

    spreadsheet5_zpsqn9nd4cu.jpg