drum turns stiff

Back the shoe adjusters off several clicks and try again.
The adjuster is all the way in. After messing with it some more, I'm thinking it might be something with the wheel bearing. When I tighten the nut enough to insert the cotter pin the drum won't turn at all. I sanded the drum it didn't have much of a ridge, but did have some surface rust as it's been apart for a month and I live at the coast.