I checked RCBS.Load and the only thing I can find using N105 with a 158 jhp in a .357 magnum is this:
158 gr. Hornady XTP, OAL of 1.575
Starting load 10.9 gr. @ 1320 fps
Max load 11.9 gr. @ 1417 fps
This data is from a VihtaVuOri reloading guide printed in 2000.
I could find nothing in any Speer manuals using N105
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