Relationship between CUP and PSI

[South Pender]

Apologies if this question has been raised before, but can someone tell me how pressure values obtained by (a) the CUP and (b) the piezoelectric pressure gauge method given in PSI differ. All estimates that I've seen have shown CUP values considerably lower than those PSI values by the piezoelectric pressure gauge method. Is there a somewhat lawful relationship between values obtained by the two methods?

 

[243Mendoza]

Google says: PSI = -17,902 + 1.516 x CUP

 

[M-61]

http://bulletin.accurateshooter.com...hats-the-difference-in-pressure-measurements/

Should help

 

[Trophied]

Not according to any info I've seen in any of my reloading information. Unless both pressures are the results of tests there is no way to calculate either from a single type of test afaik.

 

[AccelR8]

I happened to find this last week; take it for what it's worth.
https://www.shootingsoftware.com/ftp/psicuparticle2.pdf

 

[Zero333]

I was gonna link the same article as @AccelR8 .

ANSI CUP or CIP CUP ????
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There is no "perfect" correlation between the two. But you can get close

My Approximation...

40,000 cup = 42,000 psi
42,000 cup = 46,000 psi
45,000 cup = 50,000 psi
50,000 cup = 60,000 psi
52,000 cup = 62,000 psi
54,000 cup = 65,000 psi

 

[Doom]

These are two totally different methods for measuring pressure and there is no direct correlation between the two. CUP uses a copper element that deforms under pressure and was used before electronic pressure measurement techniques. While I haven't compared every cartridge, it seems that for cartridges for which CUP pressures were established the transducer pressure corresponds to the same nominal velocities as the CUP velocities.