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As everyone has stated, it's best to consult as many reloading manuals / guides as possible, especially when you start working with these high pressure cartridges.
The recommendations from the powder companies can, and do, change quite a bit from one year to the next.
These days, Alliant recommends a lighter charge of Power Pistol when working with the 125 grain bullets, to the tune of:
8.6 grains of Power Pistol (max)
125 grain JHP (or plated flat point bullet)
1.140" COAL
Such information was not in the last version of the reloader's guide. So, as with any load, take what you see here with a grain of NaCl, and start conservatively.
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