My lee 458 350 gr mold I just purchased seems to only cast 456 bullets. Not gonna work in my 45/70. I wonder if I can size them down to 452 and make a Casull load. Can’t find any load data for 345gr in any of my books. Of course I’m not asking for data to be posted but merely a point in the right direction. Also don’t know if I can force them thru a 452 sizer. All of my other Lee molds cast a little large but not this one. Any advice would be appreciated.