I am having a issue with deforming bullets while seating. I am using lee 255 gr cast bullets sized to .378 dia. I am using a .377 dia long case expander and pre compressing 55 gr swiss 1 1/2 with a card wad to a depth of .005 below base of bullet. Im using a lee seating die (375win) that's bulging some of the bullets enough that they wont chamber in my rolling block rifle. Has anyone found a seating die that fits the lee bullet . I have tried a lot of other seating dies and haven't found one to fit.