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You're correct... I stumbled onto a neighbors copy of #12 tonight & it's not included there either.
#12 was published in 1994 as was the spec on 357 sig. I guess Speer #13 may be the first place it may appear.
I found the page linked below with 124g GD data posted, and the Min/Max charges based on velocity match up with the Speer #14 data on 125g GD recipes.
I thought they would be slightly different, but it appears initial data gathering was good enough and they pulled it forward.
.357 SIG (Speer Data) reloading data with 22 loads. Using bullets from Speer Gold Dot hollowpoint. Powders include Accurate, Alliant, Vihtavuori, Hodgdon, Winchester
In case it helps, Speer #15 is the same as Dyjital's #14 page, except that they removed HS-7. Whether that was for a good reason or not, don't know. I didn't see where you specified a powder you're using, so thought I'd mention it.
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