I tried using my Lee 405 grain Boolit I use for my Marlin lever gun in my Ruger #1 45-70 but it looks like it is a no go. The shells wouldn't chamber all of the way so I tapped one in then ejected it and I saw that I had rifling marks on the boolit. I know I can seat deeper because I don't need to use the crimp groove but I would like to know if anyone has had success with another style of boolit in about the same weight.