I loaded up some oversized Cast 10 mm sized at .404 the other day. I barely flared the cases…maybe I needed to flare them more? Anyways I seated my bullets and someone dropped right into my Glock 20 chamber without having to knock the flare down flush and some would not. Instead of using my Hornaday crimp die which I used before I used my Lee crimp die. The Hornady die did not resize my Cast Boolits that were .402 and stayed the same .402 size after knocking the case bell back flush. The lee I didn’t even use the crimp. Just from running my loaded .404” loaded boolits up the die resized them to .400”. Not good since my barrel slugged at .4005” and I was getting leading with .402” sized boolits. I have since polished the inside of my barrel and wanted to try a larger boolit to see if the leading will go away. I will try and load up a dummy round and smooth out the case bell with the Hornady crimp die. I did notice that the boolits seated with a pretty good amount of pressure and made a swaging noise when seating into the cases. I loaded two different alloys to try. 11 BH in brass cases and 12.5BH in brass cases with the same results. Any suggestions? I would assume load a dummy round, crimp with the Hornady die, pull and measure is my next step?