I use WSF for full-power loads in 9mm/40S&W/45ACP. I would not suggest new reloader start out with near max/max loads using relatively slower burn rate powder.
As Walkalong posted, WST and other faster burn rate powders are better suited for lower pressure mid-to-high range load data loads that produce milder recoil.
I consider Unique/Universal to be the line that separates faster pistol powders from slower powders. For 45ACP mid range loads, I would use W231/HP-38 and faster burn rate powders - https://www.hodgdon.com/burn-rate.html
The little testing I have done with WSF with a chronograph, it seems to be interchangeable with Herco but not as bulky. I wish Hodgdon would publish more data for it 'cause it's a good powder; they just rehash the very old (and limited) Winchester data.
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