You will need to flare case mouth for any / all cartridges loaded ...rifle or handgun ... with lead boolits .
A Lyman M-Die is nice but the NOE system of m-die type inserts used in a Lee Universal Neck expander works much better . NOE also sells the Lee Universal Neck Expander if you don't already have one .
Just get a set and save yourself a lot of shaved boolits . The NOE inserts come in many different sizes and are a great value .
Gary