Seating stem profile is off for those bullets....I ran into a simular issue loading soft points for my mosin. The stem was slightly bent and would catch the edge of the soft point....I took another stem from another set and it wasxnot bent and contacted the ogive well below the lead point vs the other stem was right at the end of the jacket.
On an extreme fix I filled a seater stem on a lee dead set seater die with expoxy( jb weld) to form it to some cast bullets for my 8mm Mauser.