I had an issue with a stuck rear brake drum, with the drum stuck to the hub, and not to the shoes. I tried hammering, PB Blaster, heat gun - all to no avail. I tried to borrow a puller that Autozone seemed to have, but couldn't locate one. I ended up buying what I think is the same tool from Amazon (Astro 78830). This did the trick.
I wrapped a ratchet strap around the tool jaws to make sure they would not slide off. I couldn't wrap it around the drum, as is recommended, because the fins caused the strap to slide off. It took a fair amount of impact-wrenching before the drum popped off with a loud snap.
Hope this helps someone in the future.