IF the drum will not turn, AT ALL, then the adjuster is too tight, or the drum's rusted in place. Try the adjuster first - if it's between "lump-lumps" it is actually pressing farther out on the shoes, so make sure it settles smoothly. If it's rusted, liberally apply PBBlaster or WD40 etc. Take a good piece of hard wood and the big hammer, and use it from the back on either side of the drum working back and forth side to side to work it off. Try not to hit the drum with just the hammer use the wood - especially if it's aluminum as you will dent it or crack it.
"When all else fails, force prevails!" Ummm, we're gonna need a bigger hammer here.
67.5 SPL311 H20 w/5 speed- It lives!! Upgraded, now legal!
65 Impala Convertible