If I may, your understanding is incorrect. There isn't any this sort of detail a 'hard' or 'delicate' primers. Mil spec primers are magnum grade and less delicate to your firing pin strike. Add to quote Only demonstrate this user #eleven · Jun 20, 2010 (Edited) I would select either. https://winchesterprimers46789.topbloghub.com/38215132/the-federal-large-pistol-primers-no-150-diaries