I understand that it was invented for use with 9x19s. I bought it after reading that it throws 95-gr .380 bullets the fastest with factory-approved loads.

I've used it with all sorts of things (.41, .40, .45 ACP/AR, .38s, 357s, .45 C), and find - as you do - that it meters really well and burns pretty cleanly - and that it's nicely versatile and provides ballistics as promised (or even a bit more than promised) by the factory. I think of it sorta like a better-metering Unique. Downside is that it seems pretty flashy - WAY flashier than Unique.

Anyhow, I like Power Pistol a whole lot, and intend to keep using it.