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He most likely has an old loading manual and used that data.
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Must be a
really old manual then. My 1974 edition of the
Speer Number Nine manual lists 5.3 grains of Unique as a max load for 158gr
jacketed bullets and 4.7 for lead.
For 158gr Jacketed bullets, max loads shown are:
.38 Special 5.3g Unique = 918 fps
.357 Magnum 7.8g Unique = 1118fps
For 158gr lead bullets, max loads are around 4.7 and 7.0 grains respsectively.
Disclaimer:
WARNING: The above loads are from an older, 1974 reloading manual. Use only the published listings in a current reloading manual or guide for these calibers. TFL and the author of this post assume no liability for use of the above data!