I have loaded a lot of 9mm brass with Power Pistol powder, and am very pleased with the accuracy. It does have a bit of flash/bang compared to other powders, especially if one shoots indoors. I have loaded 115gr FMJ bullets with loads of PP starting with 5.8-6.2 grains. I have not loaded above 6.2gr as I saw no need. 5.3gr of PP would be a very "soft" load and likely not cycle most autos. You might want to load a few rounds starting at 5.8grs and work your way up.
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