If I'll, your knowledge is incorrect. There is not any this kind of thing a 'really hard' or 'delicate' primers. Mil spec primers are magnum quality and less sensitive for the firing pin hit. Given that I used to be 3 grains down below max load I felt Secure sufficient https://winchester-primers-for-sa13456.uzblog.net/top-latest-five-federal-primers-209-urban-news-45848292