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I've barely been able to find any different data. Normally the only thing that seems to change, is the powder types in the manuals I've seen.
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This is on the money. There are no differences as far as pressure spec for .38 Special and .357 Magnum in revolver or rifle data. The only exception is that I have never seen .38 Special load data for rifle and in the case of .357 Magnum loads for rifle you may see data for a few slower burning powders that aren't practical for revolver loading unless you're not concerned about the velocity loss you'd experience in using powders like IMR or H4227 and others.
