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powders I have on hand are HP-38 and Universal Clays.
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Sorry, I missed this part. ^^
I have no experience with Universal Clays - I don't even know its burn rate neighborhood.
I have and use a lot of HP-38; but have found it to be a bit persnickity in 357 for some reason. I'll spare the details. Suffice to say I prefer to use other propellants for 357.
Aside from my personal experience with HP-38/357, I would say that it might be a bit fast for the application. You'd have better luck using it under 125's, most likely - if you want to go that route.
The heavy 158's need an intermediate burn rate for this application. And that was the point of my previous post - that 1000 to 1100 f/s is doable through a 3" bbl - and with reduced flash and recoil (what I call a "balanced" round for the gun/application). With the right powder (AA#5 for me), it can certainly be done.