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MDS,
Yes, loading .357 Magnum data in .38 Special cases WILL produce higher pressure than the pressure testing indicated for the loads in .357 cases. SO, max .357 Magnum data in .38 Special case WILL produce pressures that exceed SAAMI specs for the .357 Magnum. NOT a good idea.
What I wrote was that you could probably push the .38 Special cases into the .357 Magnum PRESSURE range and still shoot them safely in .357 Magnum revolvers. Yes, you do have to adjust the .357 magnum data for the smaller case volume, if that is the data you want to work with. But, from your original post, I was getting the impression that you wanted a "little more" than .38 +P performance, rather than trying to get near magnum performance out of the Special case.
SL1
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