PSI vs CUP

Discussion in 'Ammunition & Reloading' started by crossfire, Dec 30, 2007.

  1. crossfire

    crossfire New Member

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    Anyone have a conversion formula? It tends to be confusing when some of the loads are listed by copper units of pressure and others by pounds per square inch. SAAMI limits are set in CUP; right or wrong?
     
  2. matt g

    matt g New Member Supporter

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  3. crossfire

    crossfire New Member

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    conversion

    Ok, I'm being told by everyone from the powder manufacturers to SAAMI that there is no conversion available for the "new" PSI standard and the "old" CUP standard. Makes it really difficult to compare ammo pressures when thinking about rechambering a weapon. Even when a cartridge is rated in both units, like the Casull, a conversion supposedly doesn't exist.
    The heck of it is that a professor at the University of Texas told me it's mathmatically impossible for two different units of measure to be used for calculating the same variable and there not be a conversion between them in the existence of some sort of ratio. Farenheit to Celsius to Kelvin, for example.
    If anyone has any luck with this, please let me know.
     
  4. 1hole

    1hole New Member

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    There is a lot that college professors don't know, no matter what they think they know.

    The PSI scale is largely linear but CUP is not, so no "conversion" factor can exist.