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You don't need to trim .38 Special brass. Up to around 1903, the chambers have no shoulders at all; even .357 will fit and fire (but don't do it!!).
After that, they were chambered for .38 Special and of course .38 Special will be fine. In either case, keep .38 Special loads to standard pressure levels (no +P or +P+).
Edited to add: The above does not, of course, apply to guns in .41 Colt. All service contract guns were in .38, but commercial guns were made in both calibers.
Jim
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