I'm trying to size once fired LC brass using a full size Dillon die on a 550b. I have to pull really hard on the handle to get the shellplate all the way up and then have to push real hard to get it to release.The end product doesn't fit right in the gauge. It seems to be slightly oversized near the base, even after many attempts at resizing. No amount of die adjustment will fix the prob. In the pic you can see that there's room to spare at the neck. You can also see the marks on the case after resizing. An unfired brass fits perfectly in the gauge before and after resizing. Any suggestions?