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Originally Posted by Gearhead Jim
I've seen .38 Spl as 17k, but +P as 18.5k and 20k.
+P+ was never an official spec, but I've seen 22k and 30k (wow!) listed as actual loadings.
.357 Mag as 35k and 45k.
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Just remember not to mix up CUP and PSI. For the .357 Magnum you may see 35K PSI or 45K CUP and both are correct.
CPU and PSI are not calculated the same way and there's really no way to convert one to the other. Make sure you are paying attention to what you are reading.
*EDIT*
When all else fails, go directly to SAAMI and see what they say.
http://www.saami.org/specifications_...fm?page=pubs#1
Their current data lists the standard .38 Special @ 17,000 CUP, the .38 Special +P @ 20,000 CUP and the .357 Magnum @ 45,000 CUP (remember, CUP is not PSI)