It's certainly worth a try, since the .458 Winchester is safely fired in the longer .458 Lott chamber. The .458 Winchester dies will probably work.
Running the longer case into the shorter FL size die will overly size the case neck area, but not enough to hurt it. Base and belt area will be okay too.
The neck expander can be adjusted for the longer case, of course.
The seating die will handle the longer case, but crimping will require a new adjustment.
John
