Drum not fitting oh shoes

So i was hearing a rubbing noise down the highway ignored it and for months drove it. BIG MISTAKE. i didn't even know how close i was to disaster. My rear brake shows had been pulverized. and all the hardware was destroying itself. SO said a lil prayer then ordered the parts. new spring kits and shoes. And i replaced all the stuff. found out my adjuster was broke so i ordered that. Itll be in tomorrow. But i tried to put my drum on and it went on with a hassle. It was very very tight. and it wont go on all the way. We tried to shrink the shoes but its like the dont wanna go together closer than we got them. All the springs are on right i know for a fact. But its being difficult. Why?