As John said, don't try to remove the drum from the hub, but rather, pull the hub/drum as a unit. Any possibility the master cylinder or wheel cylinder aren't releasing the shoes from the drum? Try rotating the drum as you pull it away from the spindle. If worst comes to worst you could grind the heads (back side of backing plate) off the retainers that hold the shoes in place, then back the adjuster ALL the way off. This should allow some wiggle room and the shoes should release the drum when forced.
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