I'm pretty much brand new to reloading. I got the brass, primers, power and bullets. I got a hornady lock-n-load with eveything needed. everything. I tumbled all the cases clean and went to deprime/re-size them. the problem is that some of the resize to a inside neck diameter that won't allow the bullet to slip though (I check each one this way) which seems right for when I place a new bullet there and then ram it home. But then some of them even fully ran through the die will let the bullet slip right on through. What is the problem? the brass is mixed FC .223 and Lake City 5.56. thanks in advance guys.