LUP vs. PSI

burdz19

January 08, 2009 15:51

is there a direct corelation?

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  B17-P51

  January 08, 2009 16:00

  If you mean CUP vs Psi there is a chart somewhere that translates the data, maybe NONONSENSE knows.

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  Tailgunner1954

  January 08, 2009 16:29

  LUP, Lead units of pressure
  CUP, Copper units of pressure
  
  LUP is/was normaly used in low/very low pressure rounds, IE shotgun
  CUP is/was normaly used in metalic cartridges.
  
  There is a coralation, but not a direct conversion between the metalic units and PSI. Denton Bramwell has done a fair job of working out a "close, but not perfect" formulia between CUP and psi, but I don't remember him, or anyone else, working on a LUP coralation.

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  nononsense

  January 08, 2009 16:40

  burdz19,
  
  No, there isn't a direct correlation or formula for direct conversion. The only thing that I'll say is that there is a relationship. Here is the paper:
  
  http://www.shootingsoftware.com/ftp/psicuparticle2.pdf
  
  Best.

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  burdz19

  January 08, 2009 16:42

  Thanks gents, just confusing seeing some of the reloads (12 ga.)listed as LUP and most others as PSI
  
  nononsense, great info thank you again!
  
  regards, b

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  nononsense

  January 09, 2009 06:07

  burdz19,
  
  You will see a continuation of the trend towards listing pressures in PSI as opposed to the older, antiquated CUP or LUP. This progress stems from the manufacturers doing computer simulations and calculations as opposed to testing every single load and variation. Those loads that are actually tested are analyzed with a Piezoelectric sensor which reports in PSI as opposed to crushing a copper or lead slug and measuring it. C.I.P. has been reporting in PSI for many years.
  
  Best.

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