I got one of those inexpensive "everything in a box" (except mallet) reloading kit for 9mm. I think I figured pretty much everything out except sizing cases. I tried to hammer cases fairly deep but ended up with primer pockets being way too small for primer to go in. Tried to ease up a little bit and cases don't seem to be sized and bullets when I am trying to sit them just fall through. I am pretty sure everybody tried those and Lee wouldn't be selling so many of those if they weren't good. What is the trick here?