With a lead 158:

4.5 Unique
4.6 BE-86
4.5 Universal
5.7 HS-6
4.8 CFE Pistol

All of these are "standard P" loads and clock 840-860 fps from my 4" 64-3. I cannot narrow it down to one load, as they are all equally accurate for me. So, on to like the 4th round of testing...

For a +P, my SD practice round, I load 6.3 grains of Power Pistol behind the same bullet. It clocks 1100 from the same gun.

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an actual conservative