I've used cast bullets in my "Pre-Thunder" Bersa 380
They work fine, but they are dirtier.
Since they need lube, the lube burns up and creates a lot more smoke when shooting.
This means more fouling.
Sometimes, it takes me a while to clean all the lead out too.
So I just shop a little more to find a good price on plated bullets (not jacketed) instead of saving that last few cents on cast & lubed.