I think I have found my problem. I went and smoked the end of the case like Head said. The tight fitting case had the entire shoulder clean when I extracted it. I then tried Kelbro's suggestion of moving the die down another 1/8 turn. I then sized a couple at that die setting and the cases fit a whole lot better now. They seem to chamber with minimun effort now like the factory round did. And whenI smoked it it had athin line around the case where the shoulder starts it's taper down towards the neck. I had already set the die 1/4 turn below like the RCBS instructions said. Is it common that 1/8 turn would make that much difference? And also, does this sound like they should be after FL sizing? I appreciate everyone's help.