8 3/4 drum brake question

Dump the rubber mallet. get a big hammer, and a big screwdriver hammer the drums solidly and try to get that screwdriver between the backing plate and the drum. get the drum to turn and work it off like that. you loosen the self adjusters? The parking brake is not on , is it? Also if all else fails, grind off the "head" of the hold down nail.

Tim hit the nail on the head here...

You may also try to loosen the bleeder screw to help retract the shoes if they are too tight...