If I may, your knowing is incorrect. There isn't any these factor a 'really hard' or 'soft' primers. Mil spec primers are magnum grade and less delicate to the firing pin hit. This is an older thread, you may not get a response, and could be reviving an previous thread. https://winchesterprimersforsale68912.dm-blog.com/31933688/considerations-to-know-about-federal-mag-primers