I've been casting 44 mag boolits out of my NOE mold, and I'm having trouble sizing them. They are dropping at .433 and they will not size very easily down to .431. My lead is WW mixed with some antimony (15 bhn'ish). I have lubed the die and the boolit, but it takes considerable effort to size. I practically have to hammer it home with the press handle. Any ideas or suggestions?