W231 and HP 38...
.... are the same powder and popular and versatile for pistols.
You can look on powder manufacturers websites to see what they recommend. They have a reload section.
With Bullseye or other fast burning powders it's hard to see the little bit of powder in the bottom of the case and if you double charge it it's a hand grenade. I've used it forever but you gotta be really careful with it. Give the cases flashlight or depth(dowel) test before you seat the bullets.
i'd recommend plunking your cartridges in the barrel or a gauge after reloading. Each type of case has it's own quirks that can show up in reloading. Reloading .38 was a snap, but 9mm look me a long time to get the bugs out, especially if you're like me and load range brass and experiment with different bullet types and weights.
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