It has been 20 or more years since I last cast bullets for a .45. I just dug out my moulds and what not for the .45, and thought I would cast for it again. I have both a .451 and .452 sizer die. Can't for the life of me remember why I have a .451. Does anyone size their .45acp bullets to .451? I may just try a box sized .451 to see how they shoot.