I don't reload for .357 SiG, but I'd be inclined to look at Alliant Power Pistol, BE-86, or Blue Dot, Accurate #5 or #7, or the Vihtavuori Propellants starting with N340 or slower.
I don't DISLIKE propellants from other companies, but I'm not familiar enough with them to say anything about them.
Alliant's website has several loads for the Sig. For 147 grain, I saw Unique and Power Pistol listed. I like Unique, as I find it a very good all around pistol powder.
Recieved my latest copy of HANDLOADER magazine (Oct 2021). That copy features an article on loading for the 357 SIG and several suggested loads.
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