If I may, your comprehending is incorrect. There isn't a such point a 'tough' or 'soft' primers. Mil spec primers are magnum grade and fewer sensitive for the firing pin hit. Now I do use primer flatness as being a information for when I am acquiring a tiny carried absent, https://210federalprimersforsale35678.targetblogs.com/32352789/the-best-side-of-federal-large-rifle-magnum-match-primers