Brake Drums too tight?

[Arl37]

How free should brake drums be when rotated on a 69 C10 2wd? Brakes and drums are new with only a few hundred miles on them. They are pretty tight when you spin them with tire mounted. Slight rub or drag at one point when they spin. Can only make about 1 revolution before they stop. Cant loosen because there is no slot in backing plate as they are self adjusting. Cant get drum off because brakes are so tight. Been advised may have to take spindle nut off to get drum off. Any thoughts would be appreciated.
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