I load light .38 Spl type loads in .357 brass all the time. Like GP100man I use Clays for one of my favorites using a 125 Gr bullet. It is one of the least position sensitive powders at these power levels, burns clean and is accurate. A triple charge will fit in the case, so be on your toes while loading.
I like WST or Competition with plated 148 Gr HBWC's in .357 brass. I run them at 700 ish FPS. Nice accurate soft shooting load I can shoot all day. They are also fairly position insensitive at the levels, plus the WC fills much of the space in the case. Same caveat. You can double charge a case if not paying attention.
When loading .38 Spl loads in .357 cases you may need to increase the charge .1 to .2 Grs of powder, but sometimes with very fast powders you will not find a need to do so.
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Can anyone think why Alliant would limit the .357 loadings more than with the .38 Special
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No good one.